Apollo® RPDALF 4A REDUCED PRESSURE DETECTOR ASSEMBLIES consists of two independently acting TriForce™ center stem guided check valves with a differential pressure relief valve between check valves. Designed for maximum protection against Backflow—back pressure or back siphonage—they also detect leaks or unauthorized use of water from fire or automatic sprinkler systems. They are constructed of stainless steel and come with a Type I 1/2" reduced pressure bypass sub assemblies and gallons/min meters. There are also snap-in check retainers (4"-6"), bolted-in checks (8"), low-pressure loss, and modular captured spring relief valves. Meets ASSE 1047 (with meter). UL, ULC classified, and FM approved. NSF/ANSI 372 Lead Free. Temperature range: 33° to 140°F, 180°F intermittent. Maximum working pressure: 175 psi. USC FCCCHR approved.
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