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Reduced Pressure Valve Assemblies Sizes: 2½″ - 10″ (65 – 250mm)

Series 957, 957N, 957Z Reduced Pressure Valve Assemblies prevent the reverse flow of liquids in a plumbing system due to backpressure or backsiphonage where there is a potential health hazard. Compact design and lightweight stainless steel construction (70% lighter than traditional designs) makes installation easier and faster. Groove connections also ease installation and pipe alignment. A variety of shutoff valve options are available.

Series 957 is also available with SentryPlus™ Alert technology to detect catastrophic relief valve discharge that could potentially cause flooding, and issue a multi-channel alert (call, email, text) to selected users so they can take action to avoid potentially costly flooding.


  • Available with SentryPlus Alert™ Technology for flood detection alert capabilities
  • Health hazard protection level
  • Bottom-mounted cast stainless steel relief valve. Replaceable check disc rubber
  • Patented torsion spring checks provide lowest pressure loss
  • Extremely compact and lightweight design is easy to install and service

Select a Model

Select options below to identify the UPC, Order Code, and Repair Kit for a specific 957

Approval Information

For approval information, please refer to the products specification sheet. For any other information on product certification and documentation information, please visit our certification partner websites: