Wide Compatibility:The G52 valve pool cleaner is suitable for Zodiac Polaris 180, 280, 380, 480 PRO, 3900 Sport, Vac-Sweep 380, Vac-Sweep 280, 280 TankTrax models. Version Improved: Compared with the previous backup valve, our g52 backup valve replacement kit for polaris has improved shell material, crack-resistant polymer construction, will not be easily damaged, and has a two-year service life times longer. G53 Gear Mechanism: Made in stable and friction-resistant POM material. Pom has a very low coefficient of friction and good geometric stability, especially suitable for manufacturing gears and bearings, this material is more able to withstand high water pressure operation. Easy to Install: Simply disconnect the old valve and fit the pipes into the connectors of the new one. Besides, 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 . Package Contents:1* G52 emergency valve replacement kit including G53 gear mechanism.; Any questions before purchasing or when purchasing 'use, welcome contact us, we will reply to you at the first time, thank you!