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LF757DCDA Watts

Double Check Detector Assemblies, Stainless Steel

Series LF757DCDA Lead Free* Double Check Detector Assemblies prevent the backflow of pollutants that are objectionable, but not toxic, from entering into the potable water supply. Compact housings have two independently operating tri-link check valves, two shutoff valves, and four test cocks. They feature a stainless steel housing and sleeve and are 70% lighter than traditional designs. Series LF757 is designed for non-health hazard applications and may be installed under continuous pressure service to protect against both backpressure and backsiphonage. This series is used primarily on fire sprinkler lines when it is necessary to monitor unauthorized use of water. Maximum Working Pressure: 175psi (12.06 bar).


  • Lighter than traditional designs
  • Groove fittings allow integral pipeline adjustment
  • Extremely compact design
  • Tri-link spring check provides lowest pressure loss

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Select options below to identify the UPC, Order Code, and Repair Kit for a specific LF757DCDA