Watts 957NRPDA-OSY-CFM 4 - Part of the 957RPDA Series chat-hdpe heel proof ductile iron grate

heel proof ductile iron grate supported by a bucket

Designed for heavy-duty (HD) load environments with enhanced traffic resilience

12″ channel width tailored for high-volume exterior surface drainage

70 Standard Reduced Pressure Setting-PSI 10 Strainer No Strainer Material Does Not Apply To Product Thermal Expansion Bypass No Trim Material Does Not Apply To Product Valve Style 2-way Specification Sheet - LF26A

and an adjustable packing gland

Watts 957NRPDA-OSY-CFM 4 - Part of the 957RPDA Series chat-hdpe heel proof ductile iron grateThis 4 inch reduced pressure detector backflow preventer assembly is designed to prevent the reverse flow of fire protection substances and water of non potable quality from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements. Extremely compact and lighter than traditional designs it is approved for horizontal N pattern installation.