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Stainless Steel Reduced Pressure Zone Assemblies

Series 4000SS Reduced Pressure Zone Assemblies prevent the reverse flow of polluted water from entering into the potable water supply due to backsiphonage and or backpressure. It consists of a stainless steel body construction with stainless steel internal parts. The bottom-mounted relief valve is located between the two check valves, making it suitable for installations against an outside wall. Series 4000SS has a compact design with a short lay length, ideal for retrofit installations. The 4000SS is designed for health hazard applications. Check with local water authorities for installation requirements. Maximum Working Pressure: 175psi (12.06 bar).


  • Short end-to-end dimensions make retrofit easy
  • Stainless steel construction for maximum strength and corrosion resistance
  • Stainless steel relief valve features balanced rolling diaphragm to reduce maintenance costs and eliminate sliding seats
  • Cam-check assembly provides low head loss

Select a Model

Select options below to identify the UPC, Order Code, and Repair Kit for a specific 4000SS

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: