Series 009 Watts 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 bronze body construction (1/4 to 2 in.) or FDA approved epoxy coated cast iron (2 1/2 to 3 in.), two, in-line independent check valves, replaceable check seats with an intermediate relief valve, and ball valve test cocks. Watts Series 009 is ideal for protection of health hazard cross-connections or for containment at the service line entrance. Check with local water authorities for installation requirements. Maximum Working Pressure: 175psi (12.06 bar).