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Double Check Detector Assemblyvs backflow prevention

Apollo® DCDALF 4A DOUBLE CHECK DETECTOR ASSEMBLIES are TriForce™ center stem guided with replaceable/reversible silicone seat discs. Their bypass assembly serves to measure accurate water use of up to 2 gpm, and they all come with a Type I 1/2" double check bypass sub-assembly and gallons/min meters. Other features include stainless steel bodies, drop-in check retainers (4"-6"), bolted-in checks (8"), low-pressure loss, and chloramine-resistant elastomers. Meets ASSE 1048 (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.