WSC - Water Specialties Company

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The 1/2" Wilkins 975 Reduced Pressure Zone backflow preventer was introduced in 1990 and was discontinued in 1992. The 975 was replaced by the 975XL which featured removable seats, while the original 975 did not have removable seats. All other parts will interchange between the 975 and 975XL models. The checks are a poppet style and are not self contained and there is spring pressure against the covers. The relief valve is a piston style with an internal sensing line. This device does not meet low lead laws introduced in 2014. A lead free version is available, known as the 975XL2. No special tools are required for servicing.