This is 2-1/2 to 6 Inch Zurn Wilkins 375/475 Series Reduced Pressure Zone Backflow Preventer Total Relief Valve Repair Kit. Kit Includes Relief Valve Upper Stem, Lower Plunger, RV Seat, Assembly Bolt & Retaining Washer, RV Diphragm, Relief Valve Seat Disc, Upper Plunger O-Ring, Seat O-Ring, And Piston O-Ring, And RV Spring. | Wilkins | RK212-375RVCI

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