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This first check repair kit provides all the parts necessary to repair or replace the first check on a 2 1/2 to 4 inch reduced pressure valve assembly backflow preventer, model 957 and reduced pressure detector assembly backflow preventer, model 957DCDA. This kit consists of first check module, check module O-ring and EPDM disc elastomer.
First Check Repair Kit for 2 1/2 to 4 IN Reduced Pressure Valve Assembly 957 and Reduced Pressure Detector Assembly 957DCDA