Patent ID: 9015873
Filing Date: 2015-04-28
Classification: E04H

Abstract:
1. A drain sump for use with a swimming pool or spa having a main drain pipe, said drain sump comprising: a chamber in open fluid flow communication with said swimming pool or spa; a unitary, one-piece drain pipe extension including a water flow passage extending between a normally unobstructed front opening and a rear opening for directional flow of water therethrough, said front opening positionable in open and unobstructed fluid flow communication with said chamber and said rear opening being adapted for sealed attachment to the main drain pipe in fluid flow communication therewith; said unitary, one-piece drain pipe extension including a plurality of open and unobstructed relief hole passages for open and unobstructed fluid communication between said chamber and said water flow passage; and whereby suction from a pool pump in communication with said main drain pipe causes water to enter said water flow passage at said front opening of said drain pipe extension and said plurality of open and unobstructed relief hole passages and exit at said rear opening into the main drain pipe, and whereby water is allowed to enter said water flow passage through said plurality of open and unobstructed relief hole passages in the event of an external obstruction at said normally unobstructed front opening and thereby preventing a vacuum at said front opening and within said drain pipe extension.