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Stainless Steel Double Check Detector Assemblies with Tri-Link Check Valves

Series C300, C300N Double Check Valve Assemblies prevent the backflow of pollutants that are objectionable but not toxic, from entering into the potable water supply. Its compact housing consists of two independently operating tri-link check valves, two shutoff valves, and four test cocks. It features a stainless steel housing and sleeve and is 70% lighter than traditional designs. Series C300, C300N 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).


  • Entire valve body and closure sleeve manufactured from 304 stainless steel
  • Extremely compact design is significantly lighter than traditional designs
  • Patented tri-link check provides low pressure loss
  • Can be installed under continuous pressure service and may be subjected to backpressure for nontoxic applications

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Approval Information

For approval information, please refer to the products specification sheet. For any other information on product certification and documentation information, please visit our certification partner websites: