Cash Acme RPZE Series reduced pressure zone backflow preventer with a 1-1/2" NPT connection. This backflow preventer provides maximum protection against back-pressure and back-siphonage. It has a maximum pressure of 175 psi and a maximum operating temperature of 180°F. The RPZ consists of two independently acting check valves and a relief valve. It is constructed from bronze and corrosion resistant internal components. RPZ series backflow preventers are designed to streamline the number of working parts, making maintenance easy. The unique top-entry cover allows quick access to both check valves and relief valve.