Compatible Model The G52 Relief Valve Housing Is Suitable For Zodiac Polaris 180, 280, 380, 480 Pro, 3900 Sport, Vac-Sweep 380, Vac-Sweep 280, 280 Tanktrax Models.Upgraded VersionCompared To Previous Relief Valve, Our G52 Relief Valve Replacement Kit For Polaris Has Upgraded Shell Material, Crack-Resistant Polymer Construction, Won'T Be Easily Damaged And Has Twice The Service Life. G53 Gear MechanismMade Of Stable And Friction-Resistant Pom Material. Pom Has A Very Low Coefficient Of Friction And Good Geometric Stability, Especially Suitable For The Manufacture Of Gears And Bearings, This Material Is More Able To Withstand High Water Pressure Operation.Function The Upgraded Version Will Solve The Problem When Your Pool Cleaner Is Stuck On An Obstacle, Although Your Emergency Valve Is Still Open, Water Will No Longer Spray From The Nozzle And Keep Water Out. Package Contents 1 X G52 Relief Valve Replacement Kit Including G53 Gear Mechanism. And Our Worry-Free 18-Month Warranty. For Any Reason You Are Not Completely Satisfied, You Can Request A Replacement Or A Full Refund.