The Wilkins Backflow 375 Reduced Pressure Principle Assemblies

By | November 3, 2016

If what you are looking for is a reduced pressure assembly which can protect your water supply against back siphoning and back pressure, the Wilkins backflow preventer 375 is the thing you need. It is specifically designed to handle contaminated backflow, because your safety is their number one priority. This is available in six sizes: 2 1/2”, 3”, 4”, 6”, 8”, and 10”.The Wilkins backflow 375 has been available since 2004, but upgraded models were introduced later on. Its successor, the 375 XL, is completely lead-free. Whichever your preference is, both are available in many online stores for your convenience.


Getting to know the Wilkins Backflow 375 Reduced Pressure Principle Assemblies

Specifications and other information necessary for proper installation must be known before deciding on any product. As the Wilkins 370 backflow preventer has been available for more than a decade, you are sure of that it is of a great quality. Like all reduced pressure assemblies, this is appropriate for most of your water system needs.


(Unless otherwise noted, sizes 2 1/2″ thru 10″)

ASSE® Listed 1013

IAPMO® Listed

CSA® Certified (2 1/2″ thru 8″)

AWWA Compliant C511

FM® Approved

UL® Classified

C-UL® Classified

NYC MEA 49-01-M Vol 2

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

NSF® Listed-Standard 61, Annex G*


Main valve body               Ductile Iron ASTM A 536 Grade 4

Access covers                    Ductile Iron ASTM A 536 Grade 4

Coatings                               FDA Approved fusion epoxy finish

Internals                              Stainless steel, 300 Series

NORYL™, NSF Listed

Fasteners                            Stainless Steel, 300 Series

Seal rings                             EPDM (FDA approved)

O-rings                                 Buna Nitrile (FDA approved)

Springs                                                 Stainless Steel, 300 Series

Sensing line                        Stainless Steel, braided hose


Maximum working water pressure                          175 PSI

Maximum working water temperature                  140°F

Hydrostatic test pressure                                             350 PSI

End connections (Grooved for steel pipe)            AWWA C606

(Flanged)                                                                   ANSI B16.1 Class 125



The Wilkins backflow 375 reduced pressure principle assembly follows the highest standards, with a list of standard compliance to prove it. The materials are carefully selected for longevity and effectivity. Moreover, it is rated at 140°F. The seal rings and O-rings, both FDA approved, are EPDM and Buna Nitrile respectively.

*The Wilkins backflow 375 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.