Patent Number: 6,293,013

Title: Backflow prevention assembly

Abstract: A backflow prevention assembly has a unitary housing with a passage therethrough, two threaded regions formed in an inner surface of the unitary housing, and two valve assemblies positioned in the passage to prevent fluid flow in a direction. Each valve assembly has an annular mount having a threaded outer surface that engages one of the threaded regions on the inner surface of the housing. The threads can be formed by placing a die having a thread on an outer surface thereof in contact with an inner surface of the unitary housing, and pressing on the outer surface of the housing.

Inventors: Engelmann; Lester (Woodland, CA)

Assignee: Watts Investment Company

International Classification: E03B 7/00 (20060101); E03B 7/07 (20060101); F16K 15/02 (20060101); F16K 15/03 (20060101); B21C 037/28 ()

Expiration Date: 09/25/2018