Wide CompatibilityG52 valve pool cleaner fits Zodiac Polaris 180, 280, 380, 480 PRO, 3900 Sport, Vac-Sweep 380, Vac-Sweep 280, 280 TankTrax models. Upgraded VersionCompared with the previous relief valve, our g52 relief valve replacement kit for polaris has improved shell material, crack-resistant polymer construction, won't be easily damaged, and has a lifespan of twice as long 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 better able to withstand high water pressure operation. Easy to InstallJust disconnect the old valve and tuck the hoses into the connectors of the new one. Besides, if you can't spray water after a certain period of use, we recommend that you take apart the device and check if anything is stuck, remove the debris, and you can use it normally. . Package Contents 1* G52 relief valve replacement kit including G53 gear mechanism. Features: Type : G52 Relief Valve Replacement Kit. Compatible s: Fits Zodiac Polaris Pool Cleaner Compatible Model: Fits Polaris 180 280 380 480 PRO 3900 Sport, Vac-Sweep 380, Vac-Sweep 280, 280 TankTrax. G53 gear mechanism material: POM material. Solve the problem: When the robot cleaner is stuck on obstacles or edges and it is difficult to turn around, Or even if the emergency valve is still open, water does not spurt out anymore of the nozzle, Then it is time to consider checking or replacement. Package: 1 PCS G52 Relief Valve Replacement Kit includes a G53 gear mechanism.