【Wide Compatibility】The G52 valve pool cleaner is suitable for Zodiac Polaris models 180, 280, 380, 480 PRO, 3900 Sport, Vac-Sweep 380, Vac-Sweep 280, 280 TankTrax. 【Upgraded Version】Compared with the previous relief valve, our g52 polaris relief valve replacement kit has improved the shell material, crack-resistant polymer construction, will not be easily damaged and has twice the service life. 【G53 Gear Mechanism】Made 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 Install】Just disconnect the old valve and insert the hoses into the connectors of the new one. In addition, if you can't spray water after a certain period of use, we recommend that you disassemble the device and check if anything is stuck, remove the debris and you can use it normally.