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Ames M500

Stainless Steel Reduced Pressure Detector Assemblies

Series M500 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).


2 1/2 to 10 in. (65 to 250mm)

The Maxim M500, M500N, M500Z Reduced Pressure Detector Assemblies are designed to protect drinking water supplies from dangerous cross-connections in accordance with national plumbing codes and water authority requirements for health-hazard non-potable service applications such as irrigation, fire line, or industrial processing. The Maxim M500, M500N, M500Z are used to monitor unauthorized use of water from the fire protection system.