Package dimensions ‎19 x 12.5 x 9.8 cm; 261 grams G53 gear mechanism material: POM material. 【Compatible model】 The G52 relief valve housing is suitable for Zodiac Polaris 180, 280, 380, 480 models PRO, 3900 Sport, Vac-Sweep 380, Vac-Sweep 280, 280 TankTrax. 【Upgraded Version】Compared 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 Mechanism】Made of stable POM material and abrasion resistant. 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. 【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 be sprayed from the nozzle and keep the water out.