Series 009 Reduced Pressure Zone Assemblies prevent the reverse flow of polluted water from entering into the potable water supply due to backsiphonage and or backpressure. They have a 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. 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).