The Wilkins 375 backflow preventer series are reduced pressure assemblies. The 2 1/2"-10" check body is fused epoxy coated ductile iron. The checks are accessed from a single cover on the top which is attached with a grooved coupler. The checks of the Wilkins 375 backflow series are modular. The springs are contained when the cover is removed. The checks are a glass filled Noryl modular construction and are retained in the body by clips. The spring tension is contained when the checks are removed from the body. Spring tension does not have to be released to change the check discs. The relief valve utilizes an external sensing line. The relief valve body is made of bronze. The relief valve spring is not contained when the cover is removed. The Wilkins model 375 is a horizontal piping orientation. The Wilkins model 475 is able to be changed to provide an up and down or vertical piping orientation. The repair kits for both models will be the same. In 2004 the Wilkins model 375 became available in an "A" model. The Wilkins 375A model uses a grooved end valve body configuration as opposed to the flanged end valve body.

Designed for installation on water lines in fire protection systems to protect against both backsiphonage and backpressure of contaminated water into the potable water supply. The Model 375ASTDA shall provide protection where a potential health hazard exists. Incorporates metered by-pass to detect leaks and unauthorized water use.

The Wilkins 475 and 475ADA are reduced pressure assemblies. Production of the 3/4"-2" began in 2004. The 3/4"-2" uses a bronze housing which holds the glass filled Noryl body which rests in the carriage. The checks are an inline modular design. The relief valve uses an internal sensing line. Production of the 2 1/2"-10" began in 1998. The 2 1/2"-10" check body is fused epoxy coated ductile iron. The checks are accessed from a single cover on the top which is attached with a grooved coupler. The checks are modular. The springs are contained when the cover is removed. The checks are a glass filled Noryl modular construction and are retained in the body by clips. The spring tension is contained when the checks are removed from the body. Spring tension does not have to be released to change the check discs. The relief valve utilizes an external sensing line. The relief valve body is made of bronze. The relief valve spring is not contained when the cover is removed. The model 375 is a horizontal piping orientation. The model Wilkins 475 is able to be changed to provide an up and down or vertical piping orientation. The repair kits for both models will be the same. In 2004 the 375 became available in an "A" model. The A model uses a grooved end valve body configuration as opposed to the flanged end valve body.

Wilkins 975DA 2 1/2"-10" was produced from 1990-2004. The 2 1/2"-10" size has a fused epoxy coated cast iron check body. The check seats are replaceable and the check springs are contained when the cover is removed. The relief valve is mounted to the check body and can be removed. The relief valve is a bronze bodied unit with an internal sensing line. The relief valve spring is contained when the cover is removed and the relief valve seat is replaceable.