Series LF919 Lead Free Reduced Pressure Zone Assemblies prevent the reverse flow of contaminated water from entering into the potable water supply due to back siphon age and or backpressure. It consists of a Lead Free cast copper silicon alloy body construction, two poppet style check valves and replaceable check seats, with an intermediate relief valve. Series LF919's compact modular design facilitates easy maintenance and assembly access. It is ideal for protection at health hazard cross-connections or for containment at the service line entrance. Check with local water authorities for installation requirements.