DRAFT UGANDA STANDARD  
  DUS DEAS  1017 -6 
First   Edition  
2020 -mm-dd 
 
 Reference number  
DUS DEAS  1017 -6: 2020 
© UNBS 2020  
   
Sanitary appliances — Specification — Part 6: Flushing cisterns  
 
 DUS DEAS  1017 -6: 2020  
ii                © UNBS  2020  - All rights reserved  
 Compliance with this standard does not, of itself confer immunity from legal obligations  
A Uganda Standard does not purport to include all necessary provision s of a contract. Users are 
responsible for its correct application  
© UNBS 2020  
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
form or by any means, electronic or mechanical, including photo copying and microfilm, without prior written 
permission from UNBS.  
Requests for permission to reproduce this document should be addressed to  
The Executive Director  
Uganda National Bureau of Standards  
P.O. Box 6329  
Kampala  
Uganda  
Tel: +256 41 7 333 250/1/2  
Fax: +256 41 4 286 123  
E-mail: info@unbs.go.ug  
Web: www.unbs.go.ug  
 DUS DEAS  1017 -6: 2020  
© UNBS  2020  - All rights reserved                 iii National foreword  
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Trade, Industry and 
Cooperatives established under C ap 327, of the Laws of Uganda, as amended.  UNBS is mandated to co -
ordinate the elaboration of standards and is  
(a) a member of International Organisation for Standardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Sta ndards, and  
(c) the National Enquiry Point on TBT Agreement of the World Trade Organisation (WTO).  
The work of preparing Uganda Standards is carried out through Technical Committees. A Technical 
Committee is established to deliberate on standards in a given f ield or area and consists of representatives of 
consumers, traders, academicians, manufacturers, government and other stakeholders.  
Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the 
general public for c omments. The committee reviews the comments before recommending the draft standards 
for approval and declaration as Uganda Standards by the National Standards Council.  
This Draft Uganda Standard, DUS DEAS  1017 -6: 2020 , Sanitary appliances — Specification — Part 6: 
Flushing cisterns , is identical with and has been reproduced from an East African  Standard, DEAS  1017 -6: 
2020 , Sanitary appliances — Specification — Part 6: Flushing cisterns , and is being propos ed for adoption as 
a Uganda Standard.  
The committee responsible for this document is Technical Committee UNBS/TC 4, Mechanical engineering 
and metallurgy . 
Wherever the words, “ East African  Standard " appear, they should be replaced by "Uganda Standard."  
 
 
 
 
   DEAS 1017 -6:2020  
ICS 91.140.70  
 
© EAC 2020                                                                                                                              First Edition 2020  
 DRAFT EAST AFRICAN STANDARD  
Sanitary appliances — Specification — Part 6: Flushing cisterns  
EAST AFRICAN COMMUNITY  DEAS 1017 -6:2020  
ii © EAC  2020 – All rights reserved  
 
 Copyright notice  
This EAC document is copyright -protected by EAC. While the reproduction of this document by 
participants in the EAC standar ds development process is permitted without prior permission from EAC, 
neither this document nor any extract from it may be reproduced, stored or transmitted in any form for 
any other purpose without prior written permission from EAC.  
Requests for permissi on to reproduce this document for the purpose of selling it should be addressed 
as shown below or to EAC’s member body in the country of the requester:  
© East African Community  2020 — All rights reserved  
East African Community   
P.O. Box 1096 , 
Arusha  
Tanzan ia 
Tel: + 255 27 2 162100  
Fax: + 255 27 2162190  
E-mail: eac@eachq.org  
       Web: www.eac -quality.net  
Reproduction for sales purposes may be subject to royalty payments or a licensing agreement.  
Violators may be prosecuted . DEAS 1017 -6:2020  
© EAC 2020 – All rights reserved  iii 
 Contents  Page 
Foreword  ................................ ................................ ................................ ................................ .............................  v 
1 Scope  ................................ ................................ ................................ ................................ ......................  1 
2 Normative references  ................................ ................................ ................................ ............................  1 
3 Terms and definitions  ................................ ................................ ................................ ...........................  1 
4 Materials  ................................ ................................ ................................ ................................ .................  3 
4.1 General  ................................ ................................ ................................ ................................ ...................  3 
4.2 Requirements for Particular Materials  ................................ ................................ ................................  3 
4.2.1  Ceramic ware Cisterns  ................................ ................................ ................................ ..........................  3 
4.2.2  Rubbe r compound and plastic cisterns  ................................ ................................ ..............................  3 
4.2.3  Flushing apparatus  ................................ ................................ ................................ ...............................  4 
5 Construction  ................................ ................................ ................................ ................................ ..........  4 
5.1 Cistern  ................................ ................................ ................................ ................................ ....................  4 
5.2 Cover ................................ ................................ ................................ ................................ .......................  4 
5.3 Inlet pipe.  ................................ ................................ ................................ ................................ ................  4 
5.4 Float valve  ................................ ................................ ................................ ................................ ..............  5 
5.5 Lever  ................................ ................................ ................................ ................................ .......................  5 
5.7 Chain  ................................ ................................ ................................ ................................ .......................  5 
5.8 Overflow pipe  ................................ ................................ ................................ ................................ .........  5 
5.9 Ball valves  ................................ ................................ ................................ ................................ ..............  5 
5.10  Covers  ................................ ................................ ................................ ................................ ....................  5 
5.11  Flushing mechanism  ................................ ................................ ................................ .............................  5 
5.12  Flush Pipes  ................................ ................................ ................................ ................................ ............  5 
5.13  Flush pipe ends  ................................ ................................ ................................ ................................ ..... 6 
5.14  Flush pipes for high level cisterns  ................................ ................................ ................................ ...... 6 
5.15  Flush pipes for low level cisterns  ................................ ................................ ................................ ........  6 
6 Finish  ................................ ................................ ................................ ................................ ......................  7 
7 Operational and performance requiremen ts ................................ ................................ ......................  7 
7.1 Flushing arrangement  ................................ ................................ ................................ ...........................  7 
7.2 Working water level  ................................ ................................ ................................ ...............................  7 
7.3 Freedom from self -siphonage  ................................ ................................ ................................ ..............  7 
7.4 Reduced water level  ................................ ................................ ................................ ..............................  7 
7.5 Discharge capacity  ................................ ................................ ................................ ................................  7 
7.6 Discharge rate  ................................ ................................ ................................ ................................ ........  7 
8 Testing  ................................ ................................ ................................ ................................ ....................  7 
8.1 Test of discharge capacity  ................................ ................................ ................................ ...................  7 
8.2 Test for discharge rate  ................................ ................................ ................................ ..........................  8 
8.3 Endurance test  ................................ ................................ ................................ ................................ ....... 8 
8.4 Impact test  ................................ ................................ ................................ ................................ ..............  8 
8.5 Front thrust test  ................................ ................................ ................................ ................................ ..... 8 
8.6 Dead load test  ................................ ................................ ................................ ................................ ........  9 
8.7 Resistance to distortion ................................ ................................ ................................ ........................  9 
9 Sampling and criteria for conformity  ................................ ................................ ................................ .. 9 
10 Operating instructions for dual flush cisterns  ................................ ................................ .................  10 
10.1.1  High -level flushing cistern s ................................ ................................ ................................ ...............  10 
10.1.2  Low-level flushing cisterns  ................................ ................................ ................................ ................  10 
11 Marking  ................................ ................................ ................................ ................................ .................  10 DEAS 1017 -6:2020  
iv © EAC  2020 – All rights reserved  
 
 Annex  A (norm ative)  Sampling and criteria for conformity  ................................ ................................ ....... 11 
A.1 Lot ................................ ................................ ................................ ................................ ........................  11 
A.2 Number of tests and criteria for conformity  ................................ ................................ ....................  11 
Bibliography  ................................ ................................ ................................ ................................ .....................  12 
 DEAS 1017 -6:2020  
© EAC 2020 – All rights reserved  v 
 Foreword  
Development of the East African Standards has been necessitated by the need for harmonizing requirements 
governing quality of products and services in the East  African Community. It is envisaged that through 
harmonized standardization, trade barriers that are encountered when goods and services are exchanged 
within the Community will be removed.  
The Community has established an East African Standards Committee  (EASC)  mandated to develop and 
issue East African Standards  (EAS) . The Committee is composed of representatives of the National 
Standards Bodies in Partner States, together with the representatives from the public and private sector 
organizations  in the co mmunity .  
East African Standards are developed through  Technical Committees that are representative of key 
stakeholders including government, academia, consumer groups, private sector and other interested parties. 
Draft East African Standards are circulate d to stakeholders through the National Standards Bodies in the 
Partner States. The comments received are discussed and incorporated before finalization of standards, in 
accordance with the Principles and procedures for development of East African Standards . XXXXXX.  
East African Standards are subject to review, to keep pace with technological advances. Users of the East 
African Standards are therefore expected to ensure that they always have the latest versions of the standards 
they are implementing .  
The co mmittee responsible  for this document is Technical Committee EASC /TC 037, Utensils, cutlery, 
Sanitary wares and fittings and domestic hardware . 
Attention is drawn to the possibility that some of the elements of this document may be subject of patent 
rights . EAC shall not be held responsible for identifying any or all such patent rights.  
 DRAFT EAST AFRICAN STANDARD  DEAS 1017 -6:2020 
 
© EAC 2019  – All rights reserved  1 
 Sanitary appliances — Specifications — Part 6 Flushing cisterns  
1 Scope  
This Draft East African standard covers requirement  for manually operated high -level and low -level flushing 
cisterns of capacities 5 litres and 9 litres, both single -flush and dual -flush types Cisterns, for water -closets, 
squatting pans and urinals, together with flush pipe details  
Plastic flushing cisterns are not covered in this standard . 
2 Normative  references   
The following documents are referred to in the text in such a way that some or all of their content constitutes 
requirements of this document.  For dated references, only the edition cited applies. For undated references, 
the latest edition of the referenced document (including any amendments) applies.  
DEAS 1017 -1:2019 , Vitreous sanitary appliances — Part 1: General requirements  
3 Terms and definitions  
For the purposes of this document, the terms and definitions given in DEAS 1017 -1:2019  and the  
following apply  
ISO and IEC maintain terminological databases for use in standardization at the following addresses:  
— ISO Online browsing platform: available at http://www.iso.org/obp  
3.1  
high -level c istern  
cistern  intended to operate at a minimum height of 1 250 mm between the top of the pan and the underside of 
the cistern  
3.2  
low-level c istern  
cistern intended to operate at a height not exceeding 300 mm between the top of the pan and the underside of 
the cistern . 
3.3  
coupled c istern  
cistern intended to operate to sitting on flat surface provided at the back portion of wash -down water -closets  
3.4  
dual-flush Cistern  
construction that enables the user to cause a short flush of partial discharge when only urine nee ds to be 
flushed away instead of the customary full flush  DEAS 1017 -6:2020  
2 © EAC  2020 – All rights reserved  
 
 3.5  
spill-over level  
level of which water in the flushing cisterns will first spill over if the rate of inflow  exceeds the rate of outflow 
through the warning pipe  
3.6  
warning pipe  
an overall pipe  so fixed that its outlet, whether inside or outside a building, is in a  conspicuous portion where 
the discharge of any water therefrom can be readily seen  
3.7  
water line  
a line marked inside the cistern to indicate the highest water level at which the ba ll valves  should be adjusted 
to shut off  
NOTE  A typical illustration of siphonic dual flush cisterns is given in Figure 1 and non -siphonic dual flush cisterns in 
Figure 2  
 
Figure 1 — Typical illustration of siphonic dual flush cis terns  DEAS 1017 -6:2020  
© EAC 2020 – All rights reserved  3 
 
 
Figure 2 — Typical illustration of non-siphonic dual flush cisterns  
4 Materials  
4.1 General  
4.1.1  Any component of the cistern and connecting pipe shall be of materials that are : 
a) non-corroding,  
b) protected against corrosion c aused by the action of water,  
c) fasteners shall be made of non -corroding materials.  
4.1.2  All materials used shall be water resistant.  
4.2 Requirements for Particular Materials  
4.2.1 Ceramic ware Cisterns  
The shell thickness of fire clay earthenware, stonew are and other ceramic ware cisterns, shall not be less than 
12 mm.  
4.2.2  Rubber compound and plastic c isterns  
Plastic material and rubber compounds shall be such that when assembled, the cistern shall comply with the 
following requirements:  DEAS 1017 -6:2020  
4 © EAC  2020 – All rights reserved  
 
 a) Appearances — The surface of the cistern shall be free from blisters and delamination and 
reasonably free from flow lines, streaks and colour variation.  
b) Opacity — The cistern and cover shall be opaque to white light.  
c) Distortion resistance — The cistern, when tested accor ding to the distortion test, as described in 8.7, 
shall not bulge more than 6 mm and the cover shall not be dislodged.  
d) Dead load test — The complete cistern, when installed and tested by the application of a dead load of 
23 kg as described in 8.6, the func tion and appearance of the cistern shall not be impaired.  
e) Front thrust test — The complete cistern, when installed and tested by the method described in 8.5, 
shall not distort to such an extent as to be inoperable or unsightly when the load is removed. Thi s test 
shall apply only to cisterns for use at low levels.  
f) Impact test — The complete cistern, when installed and tested as described in 8.4, shall show no 
defect after one impact and after being emptied shall show no defect after one more impact.  
4.2.3  Flushing a pparatus  
Cisterns shall have an efficient flushing apparatus of the valveless siphonic type, which prevents the wastage 
of water. The apparatus shall be capable of giving an immediate flush directly. The mechanism is operated 
when the water is at t he water line and shall be so constructed that water cannot flow down the flush pipe 
except while a flush is being properly delivered.  Flushing apparatus shall be detachable from the shell and 
suitable means shall be provided for ensuring and maintaining a  watertight joint.  
5 Construction  
5.1 Cistern  
The thickness of the body including cover shall be not less than 5 mm and 6 mm for cast iron and vitreous 
china cisterns respectively. The body of the pressed steel cistern shall be of seamless or welded constr uction. 
The body and cover of the pressed steel cistern shall be of thickness not less than 1.6 mm and 1.25 mm 
respectively before coating and shall be vitreous enamelled or otherwise protected against corrosion by 
equally efficient coating. The cistern sh all be free from manufacturing faults and other defects affecting its 
utility. All working parts shall be designed so as to operate smoothly and efficiently.  
The cistern shall be mosquito -proof; it shall be deemed to be mosquito -proof only when there is n o clearance 
anywhere in it which would permit a 1.6 mm diameter wire to pass through. The outlet of each siphon or stand 
pipe shall be securely connected to the cistern by means of a lock -nut. In the case of plastic siphon, it shall be 
provided with suitab le means of ensuring and maintaining water -tight and air -tight joint to the cistern  
5.2 Cover  
The cistern shall be provided with a removable cover, which shall fit closely and shall be secured against 
displacement. In designs where the operating mechanism is attached to the cover, the cover may be made in 
two sections, the section supporting the mechanism being securely bolted or screwed to the body.  
5.3 Inlet pipe.  
Every cistern with a side connection inlet pipe shall be provided with an inlet hole capable  of accommodating 
12 mm size ball valve, so that the horizontal centre line of the ball valve is not lower than the horizontal centre 
line of the warning pipe and not higher than 10 mm higher than the overflowing level of the warning pipe.  DEAS 1017 -6:2020  
© EAC 2020 – All rights reserved  5 
 The cistern shal l be provided with inlet and overflow holes, situated one at each end which shall be capable of 
accommodating an overflow pipe of not less than 20 mm normal bore and a 15 mm size float valve. The holes 
shall be cleanly cast or drilled and the adjacent surf aces shall be smooth . 
5.4 Float valve  
The float valve shall be of 15 mm normal size.  
5.5 Lever  
The lever shall not project beyond the side of the cistern for a distance greater than 350 mm measured from 
the centre of the cistern to the end of the lever arm . The lever arm shall be provided with a suitable hole near 
the end through which a split ring or S -hook can be inserted. A chain shall be attached to the ring or hook . 
When S -hook is employed, i t shall be effectively closed after assembly to prevent accid ental disconnection . In 
the case of low -Ievel cisterns, where the mechanism is handle operated, the handle, whether situated on the 
front or at the end of the cistern, shall be within the projection limit for lever given above . Particular  attention 
shall b e given to the ease of operation of the handle . 
5.7 Chain  
The chain shall be of such a strength as to sustain a dead load of 50 kg without any apparent or permanent 
deformation of the shape of the links. The chain shall terminate to a suitable handle or pu ll made of hot -dip 
galvanized Iron or non -ferrous metal or a moulding to any heat resisting and non -absorbent plastic or any 
other equally suitable material. The finish shall be smooth and all burrs which are liable to cause injury to the 
hand shall be rem oved.  
5.8 Overflow pipe  
The overflow pipe shall be of not less than 20 mm normal bore and shall incorporate a non -corrodible  
mosquito -proof device secured in a manner which will permit it to be readily cleaned or renewed when 
necessary. No provision shall be made whereby the overflow from the cistern shall discharge directly into the 
water -closet or soil pipe without being detected. The invert of the overflow pipe in the case of high level and 
low-level cisterns and the top edge of the overflow pipe in the case of coupled cisterns shall be 19 mm 
minimum above the working water level in case of overflow due to any reason .  
Water should drain out through the overflow pipe and not through the siphon pipe minimum above the working 
water level in case of overflow  due to any reason, water should drain out through the overflow pipe and not 
through the siphon pipe . 
5.9 Ball valves  
Cisterns shall be so constructed that the ball valve shall be capable of being set on installation, to close when 
the water reaches the wa ter line.  
5.10 Covers  
Cisterns shall be provided with a removable cover. The cover and any screws, bolts or other component parts 
shall be corrosion resistant.  
5.11 Flushing mechanism  
Flushing mechanism shall be easy to operate.  No aperture in the shell fo r the operating lever shall permit 
water to leak from the cistern at a point below the overflowing level of the warning pipe.  
5.12 Flush Pipes  
Flush pipes shall be made of the following materials:  DEAS 1017 -6:2020  
6 © EAC  2020 – All rights reserved  
 
 a) Copper,  
b) Copper alloys,  
c) Unplasticized PVC or a suitable co -polymer.  
5.13 Flush pipe ends  
The upper end of the flush pipes shall be provided with a suitable means of ensuring and maintaining 
watertight and airtight joint to the flushing cistern and the flush pipes shall be detachable from the flushing 
cistern. The l ower end of the flush pipes shall be finished with a plain end for connection to the WC pan by 
means of a suitable joint.  
5.14 Flush pipes for high level cisterns  
Flush pipes for use with cisterns at high level shall have an internal diameter of not less t han 32 mm. Their 
other dimensions shall be as shown in Fig ure 1. They shall be either of one piece construction or made in 
sections and shall be water tight in the length.  
 
Figure 3 — Dimensions of flush pipes  
5.15 Flush pipes for  low level cisterns  
Flush pipes for use with cisterns at low level shall have an internal diameter of not less than 32 mm.  DEAS 1017 -6:2020  
© EAC 2020 – All rights reserved  7 
 6 Finish  
Cisterns and flush pipes shall be of sound construction throughout and shall be free from manufacturing  faults 
and other def ects affecting their utility. Any working parts shall operate smoothly and efficiently . 
7 Operational and performance requirements  
7.1 Flushing arrangement  
The cistern underworking conditions and with the ball valve in closed position shall operate on a si ngle 
operation of the lever without calling for a sudden jerk in pulling. If a valve is used instead of Siphon for 
flushing purposes, the valve shall be completely leak proof . 
7.2 Working water level  
The working water level shall be a minimum of 65 cm belo w the effective top edge of the cistern and shall be 
legibly and indelibly marked on the inside of the cistern . 
7.3 Freedom from self -siphonage  
The siphonic system shall be capable of being rapidly brought into action when the water is at the working 
water  level, but shall not self -siphon or leak into the flush pipe when the water is up to 1.0 cm above the Invert 
of the overflow pipe  
7.4 Reduced water level  
The discharge shall operate satisfactorily when the cistern is filled to a level up to 1.0 cm below t he working 
water level  
7.5 Discharge capacity  
When tested in accordance with the procedure described in 8.1 . cisterns of 5 litres and 9 litres capacities, 
when required to give a full flush shall respectively discharge 5 litres and 9 litres with a deviatio n of ±0.5 litres . 
7.6 Discharge rate  
When tested in accordance with the procedure described in 8.2 the cisterns shall discharge:  
a) The full flush at the rate of 9 litres in not more than 5 s when fitted with high level type flush pipe.  
b) At the rate of 9 litre s in not more than 8 s when filtered with a low level type flush pipe.  
8 Testing  
Cisterns shall be tested an accordance with the test procedures given m 8.1, 8.2 and 8.3 the tests in 8.1 and 
8.2 may be combined in one operation, if desired.  
8.1 Test of dis charge capacity  
With the water supply shut off or the cistern disconnected, and with the ball valve fitted, fill the cistern with 
water up to the marked water line. Operate the flushing mechanism and on completion of the flush, measure 
the quantity of wate r that has to be added to refill the cistern to the level of the marked water line. 
Alternatively, any suitable device may be used for measuring the quantity of water discharged from the 
cistern . The cistern should have a flush pipe fitted but need not be connected to a pan for this test . DEAS 1017 -6:2020  
8 © EAC  2020 – All rights reserved  
 
 8.2 Test for discharge rate  
Connect the cistern to an appropriate flush pipe. Fill the cistern to the water lane as for the capacity test and 
place a vessel under the open end of the flush pipe Operate the flush mechanism and as water appears at the 
open end of the flush pipe start a stop watch. At the end of 6 s in case of cistern of 10 litres and 6/3 litres 
capacity, 3 s in case of cistern of 5 litres capacity, rapidly draw the vessel clear or otherwise divert the flow of  
water. Ascertain either by measuring or weighing the volume of water collected in the vessel  
For the purpose of test, the following shall be deemed to be the appropriate flush pipe  
a) A vertical steel pipe, 1 250 mm long, having a nominal Internal diameter o f 32 mm, in the case of 
high-level Cisterns, and  
b) A vertical steel pipe, 300 mm long, having a  nominal internal diameter of 38 mm in case of Orissa 
pan/squatting pan, pipe shall be minimum 700 mm long . 
8.3 Endurance test  
A sample of flushing cistern picked at random from production shall be first checked for conformity to the 
requirements for materials and construction and operational and performance requirements . If It complies with 
these requirements, i t should be operated 3000 times . After this test, the cistern and its component parts shall 
not show any damage or defects and all the parts shall be satisfactory . Necessary  checks shall be made for 
this purpose . If a valve has been used instead of siphon, during the test run of 3 000 times the valve should 
show no si gn of leakage when the cistern is  operated to Its rated capacity . 
Note  This is a type test to be carried out by recognized testing laboratory and shall be conducted whenever there 
are changes in the design materials, manufacture and construction . 
8.4 Impact test  
Suspend a 1 kg steel ball by a fine wire 2.5 m long. The point of suspension being located vertically over the 
point of impact.  
Release the ball from a point directly in front of the cistern at a horizontal distance of 1 m away from the poi nt 
of impact, the point of impact being 75 mm from the bottom and on the centre line of the cistern.  
8.5 Front thrust test  
The complete cistern, when installed and filled shall be used.  Apply horizontally a front thrust of 110 N through 
a 150 mm diameter d isc as high up as possible to the  front of t he cistern on its centre line. The disc shall be 
faced with a soft material such that the face shall  conform to the contour of the cist ern shell, as shown in 
Figure 3. DEAS 1017 -6:2020  
© EAC 2020 – All rights reserved  9 
 
 
Note : Applied weight to be adjusted to giv e a horizontal thrust of 110 N. This can be determined initially by a spring 
balance at ‘x’  
Figure 4 — Front thrust test apparatus  
The cistern shall not distort to such an extent as to be inoperable or unsightly when the load is re moved.  
NOTE: This test applies only to cisterns for use at low levels  
8.6 Dead load test  
The complete cistern, when installed and filled shall be used.  
A dead load of 23 kg is applied 6 mm from the end of the operating level arm for 30 s. No distortion sha ll be 
observed.  
The function and appearance of the cistern shall not be impaired 30 s after the load is removed.  
8.7 Resistance to distortion  
Fasten the cistern, complete with its fitments and cover by its normal fixing devices to a solid background. Fill 
the cistern with water to the waterline.  
The cistern shall not bulge more than 6 mm and the cover shall not be dislodged  
9 Sampling and criteria for conformity  
The sampling procedure and criteria tor conformity of a lot to the requirements of this specific ation shall be as 
specified in Annex A . DEAS 1017 -6:2020  
10 © EAC  2020 – All rights reserved  
 
 10 Operating instructions for dual flush cisterns  
10.1 Every cistern of the dual -flush type shall bear a legible lettering in a conspicuous position the operating 
instructions specified in 1 0.1.1 to 1 0.1.3 and these instructions shall not be readily removable. In addition, 
when so ordered by the purchaser, a separate self -adhesive or other suitable label shall be supplied for use in 
association with the operating handIe when the cistern is installed in a concealed pos ition. Flushing cisterns of 
6/3 litres capacity shall be used with sanitary appliances of equivalent capacity . 
10.1.1 High -level flushing cisterns  
The instruction shall read as  
Half-flush: PuII and let go  
Full flush: Pull and hold  
And shall appear as follo ws: 
a) For reversible cisterns, On or near the lower edge of both long sides of the cistern shell, and  
b) For non -reversible cistern , On or near the lower edge of the front of the cistern shell  
10.1.2 Low-level flushing cisterns  
The instruction shall read as:  
Half-flush:  Press and let go  
Full-flush:  Press and hold  
And shall appear on the upper half of the front of the cistern shell  
10.1.3 Where half flush and full flush is operated by a knob, the instructions given in 1 0.1 and 1 0.1.2 shall 
not be applicable . Oper ating instruction specified in 1 0.1.3.1 shall however be followed .  
11 Marking  
Each cistern shall be legibly and indelibly marked with the manufacturer's name or trademark  on the body 
either inside or outside as found convenient to the manufacturer . The di scharge capacity and operating 
instructions shall also be marked on the cistern indelibly.  DEAS 1017 -6:2020  
© EAC 2020 – All rights reserved  11 
 Annex  A 
(normative)  
 
Sampling and criteria for conformity  
A.1 Lot  
All the cisterns of the same type and level, similar m respect of materials, design and constructi on and 
produced essentially under similar conditions of manufacture shall be grouped to constitute a lot  
A.2 Number of tests and criteria for conformity  
A.2.1  For determining the conformity of the lot to the requirement of material, construction and finish , a 
number of sample cisterns in accordance with Table A.1 shall be selected at random . The lot shall be 
considered to conform to the requirements of material, construction and finish if the number of the sample 
cisterns not meeting all of these requiremen ts does not exceed the correspond number given in Table A.1  
A.2.2  If the lot has been found conforming in A.2.1, it shall be tested for operational and performance 
requirements for which a number of cisterns (sub -sample) shall be taken at random according to Table A.1 
from the sample cisterns found satisfactory in A.2.1.  
A.2.2.1  The lot shall be considered to conform to the operational and performance requirements If the number 
of sample cisterns not meeting these requirements does not exceed the correspond ing number given in Table 
A.1 
A.2.3  For endurance, the test shall be performed whenever there are changes in the design, materials, 
manufacture and construction from the first lot after such a change takes place, 1 cistern at random shall be 
taken from tho se already found satisfactory in A.2.1 and A.2.2 in respect of all other requirements of this 
specification. If this sample cistern passes the endurance test the lot to which the sample belongs and all the 
subsequent lots manufactured under the same condit ions of design, materials, manufacture and construction 
shall be deemed to conform to the endurance test till and change takes place . 
Table A. 1 — Scale of sampling and criteria for conformity  
Number of 
cisterns in the lot  For materi al construction and 
finish  For operational and 
performance requirements  
Sample size  Acceptance 
number  Sub-sample 
size Acceptance 
number  
Up to 50  8 0 5 0 
51-100 13 0 8 0 
101-150 20 1 13 0 
151-300 32 1 20 1 
301-500 50 2 32 1 
501 and above  80 3 50 2 
 DEAS 1017 -6:2020  
12 © EAC  2020 – All rights reserved  
 
 Bibliography  
[1] IS 774:2004,  Flushing cisterns for water closets and urinals (other than plastic cisterns) — 
Specification  
[2] KS 1281: 1996 , Specification for water closet flushing cisterns  
 CD/UG/5:2019    
 
© EAC 2019  – All rights reserved