Feature●【Perfect Fit】 RK34-375 Complete Valve Repair Kit perfectly fits for 1/2” 3/4” Model 375/375XL/375ST Reduced Pressure Principle Backflow Preventer. Contains all Check assembly #1 and #2 components, all relief valve components, 1 lubricant, 1 Relief Valve Spring, 6 O-rings for Housing Inlet, Housing Outlet, Sleeve, Relief Valve Seat, Relief Valve Stem and Relief Valve Cover. Replace OE Part # RK34-375, RK34-375R●【Fix Water Leakage】 Directly replace your old, worn out relief valve. Fix your backflow preventer leakage problems, prevent polluted water from entering clean water supply system, eliminate noise. Instead of full replacement, only partial replacement is required, saving a lot of time and charge for you and extend service life of the product. Meanwhile, easy replacement allows you to replace yourself, suitable for DIY.●【Built to Last】 Made of premium grade ABS, rubber and steel. Features excellent corrosion and water resistance, high strength performance. High quality material ensures reliable and long-lasting use. Each part is manufactured to meets or exceeds OEM specifications, precision-engineered and tested to provide reliable replacement.●【Easy to Install】 Easy to install with no special tools required. Preinstalled check assemblies allow you to speed up repairs. Easy to install, suitable for DIY.●【100% Satisfaction Guarantee】 Your satisfaction is our priority. We strive to give our customers excellent service. All Sixcow products support 30-Day money-back guarantee, 12-Month warranty for quality-related issues. Simply return it for your warranty.Description RK34-375 RK34-375R Complete Valve Repair Kit for 1/2"-3/4" Model 375, 375XL, 375ST Reduced Pressure Principle Backflow Preventers, Includes All Check Relief Valve O-Ring Assembly