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This 6 IN check rubber parts repair kit for series 757 and 757DCDA helps prevents the backflow of pollutants that are objectionable but not toxic, from entering into the potable water supply. It features a check module O-ring, red silicone disc elastomer and a E-clip. It is designed for non-health hazard applications.
WATTS® RK-757/757DCDA Series 0899203 Double Check Detector Backflow Repair Kit, 6 in, Rubber