The Wilkins Backflow 975XL Reduced Pressure Principle Assemblies

By | November 3, 2016

If what you are looking for is a backflow preventer capable of protecting the potable state of your water supply, then the Wilkins backflow 975XL is for you. This is available in five sizes: 3/4″, 1”, 1 1/4”, 1 1/2”, and 2”.This model is designed to handle back pressure and back siphonage through its two check valves and relief valve. It has predecessor, the Wilkins 975xl backflow preventer, which operates exactly the same way the 975 XL does. However, the latter offers replaceable check seat made of glass-filled Noryl as well as silicon check disks. Moreover, the relief valve seat became replaceable too.

Getting to know the Wilkins backflow 975XL reduced pressure principle assemblies

The most important thing about choosing the appropriate backflow preventer is going to the technical. Sure, you already know that Wilkins is a big name in the market. However, that does not tell you much about how its usefulness for your purposes. If you are set on purchasing the Wilkins backflow preventer 975 XL, but wants to make sure before shelling out some cash, read on.


Main valve body               Cast Bronze ASTM B 584

Access covers                    Cast Bronze ASTM B 584

Fasteners                            Stainless Steel, 300 Series

Elastomers                          Silicone (FDA Approved)

Buna Nitrile (FDA Approved)

Polymers                             Noryl™, NSF Listed

Springs                                 Stainless Steel, 300 series


Standards Compliance

ASSE® Listed 1013

IAPMO® Listed

UL® Classified (less shut-off valves or with OS&Y valves

C-UL® Classified

CSA® Certified B64.4

AWWA compliant C511

Approved by the Foundation for Cross Connection Control and Hydraulic Research at the University of Southern California

NYC MEA 425-89-M VOL 3


Maximum working water pressure          175 PSI

Maximum working water temperature 180°F

Hydrostatic test pressure                             350 PSI

End connections Threaded                          ANSI B1.20.1


The Wilkins backflow 975XL Reduced Pressure Principle Assemblies have complied with the highest standards, beyond what is required of it. It is made of different materials such as main valve body, access covers, fasteners, and elastomers. This device is also rated 180°F, equipped with full port ball valves. Indoor installation require additional accessories such as the air gap adaptor and the integral monitor switch.

*The Wilkins backflow 975XL Reduced Pressure Principle assemblies must only be installed by qualified and licensed technicians. Moreover, it must be ensured that the right product was selected for the particular installation. Improper selection and installation may result in malfunctioning, thus defeating the purpose of having a backflow preventer.