Document:

EX-10.4

PLEXUS CORP.

RESTRICTED STOCK UNIT AGREEMENT

TO: [name]

DATE: [date]

In order to provide additional incentive through stock ownership for certain officers and key
employees of Plexus Corp. (the “Corporation”) and its subsidiaries, you (the “Grantee”) are hereby
granted a restricted stock unit award (“Award”) effective as of      , 20     (the “Grant Date”).
This Award is subject to the terms and conditions set forth in this Agreement and in the Plexus
Corp. 2005 Equity Incentive Plan (the “Plan”), the terms of which are incorporated herein by
reference.

1. NUMBER OF UNITS

This Restricted Stock Unit Award applies to      shares of the Corporation’s Common
Stock, $.01 par value (the “Restricted Stock Units”). The Restricted Stock Units granted under
this Agreement are units that will be reflected in a book account maintained by the Corporation
until they become vested or have been forfeited.

2. VESTING REQUIREMENTS

[One of the following alternatives shall be designated. If no alternative is designated,
Alternative 1 shall apply]:

	 	 	 	[ ] Alternative 1: This Award shall become vested in accordance with the
schedule set forth below:

	 	 	 	 	 
	Years After	 	 
	Grant Date	 	% of Units Becoming Vested
	Less than 1

	 	 	0	%
	 
	 	 	 	 
	1 but less than 2

	 	Thirty Three and one third percent (33?%)

	 
	 	 	 	 
	2 but less than 3

	 	Sixty six and two thirds percent (66?%)

	 
	 	 	 	 
	3 but less than 10

	 	One hundred percent (100%)

[ ] Alternative 2: This Award shall become vested in accordance with the schedule established
by the Committee at the time of grant and set forth below:

Notwithstanding the foregoing, the Award shall fully vest upon a Change in Control, as defined
in the Plan.

	 	 	 	3.

1

RESTRICTED PERIOD

The period of time during which the Restricted Stock Units are forfeitable is referred to as
the “Restricted Period.” If your employment with the Corporation or one of its subsidiaries
terminates during the Restricted Period for any reason, then the unvested portion of the Award will
be forfeited on the date of such termination of employment.

4. RIGHTS DURING RESTRICTED PERIOD

During the Restricted Period, you will not have any right to vote the Restricted Stock Units
or to receive credit for cash dividends. You will not be deemed a stockholder of the Corporation
with respect to any of the Restricted Stock Units. The Restricted Stock Units may not be sold,
assigned, transferred, pledged, encumbered or otherwise disposed of prior to vesting.

5. SETTLEMENT OF RESTRICTED STOCK UNITS

As soon as practicable after the Restricted Stock Units become vested, the Corporation shall
issue to you one share of Common Stock for each Restricted Stock Unit which becomes vested.

6. TAX WITHHOLDING

The Corporation shall have the power and right to deduct or withhold, or require you to remit
to the Corporation, an amount sufficient to satisfy Federal, state and local taxes required by law
to be withheld with respect to issuance of shares under this Agreement. You may make a written
election, subject to the approval of the Committee, to satisfy this withholding requirement, in
whole or in part, by having the Corporation withhold shares having a Fair Market Value on the date
the tax is to be determined equal to the minimum marginal total tax which could be imposed on the
transaction.

7. TRANSFER RESTRICTIONS AFTER VESTING

Under applicable securities laws, you may not be able to sell any shares for a period of time
after vesting, and you must comply with the Corporation’s Insider Trading Restrictions and Policies
(copy attached). The Corporation’s counsel should be consulted on your ability to sell your shares
under the 1934 Act.

8. NO EMPLOYMENT AGREEMENT INTENDED

Neither the establishment of, nor the awarding of Awards under this Plan shall be construed to
create a contract of employment between you and the Corporation or its subsidiaries; nor does it
give you the right to continue in the employment of the Corporation or its subsidiaries or limit in
any way the right of the Corporation or its subsidiaries to discharge you at any time and without
notice, with or without cause, or to any benefits not specifically provided by this Plan, or in any
manner modify the Corporation’s right to establish, modify, amend or terminate any profit sharing,
retirement or other benefit plans.

	 	 	 	9.

2

WISCONSIN CONTRACT

This Agreement reflects an Award made in Wisconsin and shall be construed under the laws of
that state without regard to the conflict of laws provision of any jurisdiction.

To accept this grant, agreement and other linked materials please logon with your user name
and password to www.etrade.com/stockplans.com and select the Stock Options page. This
grant will be listed at the bottom of all prior grants and will be labeled in the status column as
“Requires Acceptance”. Clicking on this link will take you to the Grant Acceptance page which will
allow you to view and print (recommended) all applicable documents related to this grant. To
accept the grant and all applicable documents you will type in your password and click accept. By
accepting this grant online you acknowledge and accept this grant and the terms and conditions.
You also acknowledge receipt of this Restricted Stock Unit Agreement, a copy of the 2005 Equity
Incentive Plan, and a copy of the Insider Trading Restrictions and Policies. If this grant is not
accepted online within 30 days from the grant date of this Agreement, this Award will be deemed
refused and may be withdrawn.

The terms of the Plan shall have precedence over any terms in this Agreement that are
inconsistent therewith.

PLEXUS CORP.

By: /s/ Joseph D. Kaufman

	 	 	 	Secretary

3STOCK PURCHASE AGREEMENT

         This Stock  Purchase  Agreement (the  "Agreement")  is made and entered
into as of the 1st day of April, 2005, between Contran  Corporation,  a Delaware
corporation ("Seller"), and Valhi, Inc., a Delaware corporation ("Valhi").

                                    Recitals

         Seller  wishes to sell  2,000,000  shares (the  "Shares") of the common
stock,  $0.01 par value per share, of Valhi owned by Seller, to Valhi, and Valhi
wishes to purchase  the Shares,  on the terms and subject to the  conditions  of
this Agreement (the "Transaction").

                                    Agreement

         The parties agree as follows:

                                   ARTICLE I.
                                 THE TRANSACTION

         Section  1.1.  Purchase  and Sale of  Shares.  Against  payment  of the
purchase  price  therefor as  specified  in Section 1.2,  Seller  hereby  sells,
transfers,  assigns and delivers to Valhi the Shares.  Certificates representing
the Shares are hereby  delivered  accompanied  by stock powers duly  endorsed in
blank.

         Section 1.2. Purchase Price and Payment.  Valhi hereby purchases all of
the Shares for a purchase  price of $17.50 per Share in cash,  payment for which
is hereby made by means of a transfer of  $35,000,000.00 to an account specified
by Seller.

                                   ARTICLE II.
                  REPRESENTATIONS AND WARRANTIES OF THE SELLER

         Seller hereby  represents  and warrants to Valhi as of the date of this
Agreement as follows:

         Section 2.1.  Authority.  It is a corporation  validly  existing and in
good  standing  under  the laws of the state of its  incorporation.  It has full
corporate  power and  authority,  without  the  consent or approval of any other
person, to execute and deliver this Agreement and to consummate the Transaction.
All corporate action required to be taken by or on behalf of it to authorize the
execution, delivery and performance of this Agreement has been duly and properly
taken.

         Section 2.2. Validity. This Agreement is duly executed and delivered by
it and  constitutes  its lawful,  valid and binding  obligation,  enforceable in
accordance with its terms.  The execution and delivery of this Agreement and the
consummation  of the  Transaction by it are not prohibited by, do not violate or
conflict  with any  provision  of, and do not result in a default  under (a) its
charter or bylaws; (b) any material  contract,  agreement or other instrument to
which it is a party or by which it is bound;  (c) any order,  writ,  injunction,
decree or judgment of any court or governmental  agency applicable to it; or (d)
any law,  rule or  regulation  applicable  to it,  except  in each case for such
prohibitions,  violations,  conflicts or defaults that would not have a material
adverse consequence to the Transaction.

         Section 2.3. Ownership of Shares. It is the record and beneficial owner
of the Shares and upon  consummation  of the  transactions  contemplated by this
Agreement,  Valhi will acquire good and marketable title to the Shares, free and
clear of any liens,  encumbrances,  security interests,  restrictive agreements,
claims or imperfections  of any nature  whatsoever,  other than  restrictions on
transfer imposed by applicable securities laws.

                                  ARTICLE III.
                 REPRESENTATIONS AND WARRANTIES OF THE PURCHASER

         Valhi  hereby  represents  and warrants to the Seller as of the date of
this Agreement as follows:

         Section 3.1.  Authority.  It is a corporation  validly  existing and in
good  standing  under the laws of the State of Delaware.  It has full  corporate
power and  authority,  without the consent or approval of any other  person,  to
execute and deliver  this  Agreement  and to  consummate  the  Transaction.  All
corporate  and  other  actions  required  to be taken by or on  behalf  of it to
authorize the  execution,  delivery and  performance of this Agreement have been
duly and properly taken.

         Section 3.2. Validity. This Agreement is duly executed and delivered by
it and  constitutes  its lawful,  valid and binding  obligation,  enforceable in
accordance with its terms.  The execution and delivery of this Agreement and the
consummation  of the  Transaction by it are not prohibited by, do not violate or
conflict  with any  provision  of, and do not result in a default  under (a) its
charter or bylaws; (b) any material  contract,  agreement or other instrument to
which it is a party or by which it is bound;  (c) any order,  writ,  injunction,
decree or judgment of any court or governmental  agency applicable to it; or (d)
any law,  rule or  regulation  applicable  to it,  except  in each case for such
prohibitions,  violations,  conflicts or defaults that would not have a material
adverse consequence to the Transaction.

         Section 3.3. Purchase for Investment.  It is purchasing the Shares sold
and delivered to it hereunder for investment  solely for its own account and not
with a view to, or for resale in connection with, the distribution  thereof.  It
understands that such Shares are restricted  securities under the Securities Act
of 1933, as amended (the  "Securities  Act"),  and that such Shares must be held
indefinitely  unless  they  are  registered  under  the  Securities  Act and any
applicable  state  securities  or  blue  sky  laws  or an  exemption  from  such
registration is available.

         Section 3.4. Nature of Purchaser.  It has such knowledge and experience
in financial and business  matters that it is capable of  evaluating  the merits
and risks of the purchase of the Shares.

                                   ARTICLE IV.
                               GENERAL PROVISIONS

         Section 4.1. Survival.  The representations and warranties set forth in
this   Agreement   shall  survive  the  execution  of  this  Agreement  and  the
consummation of the transactions  contemplated  herein.  The covenants and other
agreements set forth in this Agreement shall terminate on the tenth  anniversary
of this Agreement.

         Section  4.2.  Amendment  and  Waiver.  No  amendment  or waiver of any
provision  of this  Agreement  shall in any event be  effective  unless the same
shall be in a writing  referring  to this  Agreement  and signed by the  parties
hereto,  and then such  amendment,  waiver or consent shall be effective only in
the specific instance and for the specific purpose for which given.

         Section 4.3. Parties and Interest.  This Agreement shall bind and inure
to the  benefit  of  the  parties  named  herein  and  their  respective  heirs,
successors and assigns.

         Section 4.4.  Entire  Transaction.  This Agreement  contains the entire
understanding  among the parties with respect to the  transactions  contemplated
hereby and supersedes all other agreements and understandings  among the parties
with respect to the subject matter of this Agreement.

         Section 4.5.  Applicable  Law. This Agreement  shall be governed by and
construed in accordance with the domestic laws of the State of Delaware, without
giving effect to any choice of law or conflict of law provision or rule (whether
of the  State of  Delaware  or any  other  jurisdiction)  that  would  cause the
application of the laws of any jurisdiction other than the State of Delaware.

         Section 4.6. Severability.  If any provision of this Agreement is found
to violate any statute,  regulation,  rule,  order or decree of any governmental
authority,  court,  agency or exchange,  such invalidity  shall not be deemed to
effect any other  provision  hereof or the  validity  of the  remainder  of this
Agreement  and such  invalid  provision  shall be deemed  deleted to the minimum
extent necessary to cure such violation.

         Section  4.7.  Notice.  All  notices,   requests,   demands  and  other
communications  hereunder shall be in writing and shall be sent by registered or
certified mail, postage prepaid as follows:

         If to the Seller:                  Contran Corporation
                                            5430 LBJ Freeway
                                            Three Lincoln Centre, Suite 1700
                                            Dallas, Texas 75240-2697
                                            Attention:  Secretary

         If to the Purchaser:               Valhi, Inc.
                                            5430 LBJ Freeway
                                            Three Lincoln Centre, Suite 1700
                                            Dallas, Texas 75240-2697
                                            Attention:  General Counsel

         Section 4.8.  Headings.  The sections and other  headings  contained in
this  Agreement are for reference  purposes only and shall not effect in any way
the meaning or interpretation of this Agreement.

         Section 4.9. Expenses.  Except as otherwise  expressly provided herein,
each party to this Agreement  shall pay its own costs and expenses in connection
with the transactions contemplated hereby.

         The parties  hereto have caused this  Agreement to be executed by their
duly authorized officers as of the date first written above.

                                           CONTRAN CORPORATION

                                           By:  /s/ Bobby D. O'Brien
                                                --------------------------------
                                                Bobby D. O'Brien, Vice President

                                           VALHI, INC.

                                           By:   /s/ Steven L. Watson
                                                 -------------------------------
                                                 Steven L. Watson, President

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