Skip to Main Content

LF850 Large

Lead Free* MasterSeries In-Line Double Check Valve Assemblies - Large Diameter

  • Utilizes advanced ArmorTek coating technology to resist corrosion of internals
  • The valve body shall utilize a coating system with built in electrochemical corrosion inhibitor and microbial inhibitor
  • Prevents the backflow of pollutants that are objectionable (non-toxic) from entering into the potable water supply
  • Primarily used on potable drinking water systems where code mandates protection from backpressure and backsiphonage conditions
  • Winterization feature with disc retainers and valve body drain ports
  • Inline serviceable assembly requires no special tools

Select a Model

Select options below to identify the UPC, Order Code, and Repair Kit for a specific LF850 Large

Approval/Certification Information

For product-specific approval information, please refer to the product’s specification sheet or ask a Watts representative. For general information regarding any approval certification partners identified in the specification sheet, please visit our certification partners’ websites:


ASSE CSA FM Approvals NSF
UL ULC USC WQA