Skip to Main Content


Stainless Steel Reduced Pressure Detector Assemblies

Series M500, M500N, M500Z Reduced Pressure Detector Assemblies to prevent the reverse flow of fire protection system substances from being pumped or siphoned into the potable water supply. The M500 incorporates a meter to detect ground leaks and unauthorized illegal taps, greatly reducing annual water expenses. It consists of a compact, stainless steel body with stainless steel internal parts, two check valves, a pressure-differential relief valve, shutoff valves, torsion spring checks and relief valve, and bronze, nickel-plated test cocks. Series M500, M500N, M500Z features the certified lowest pressure loss, is 70% lighter than traditional designs and is ideal for health hazard cross-connections, such as on fire sprinkler systems. Check with local water authorities for installation requirements. Maximum Working Pressure: 175psi (12.06 bar).


  • Patented link check provides low pressure loss
  • Protects drinking water supplies against dangerous cross-connections, plus detects loss due to underground water leaks or unauthorized water usage
  • Extremely compact design is significantly lighter than traditional designs
  • Entire valve body and closure sleeve manufactured from 304 stainless steel

Select a Model

Select options below to identify the UPC, Order Code, and Repair Kit for a specific M500

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: