Compatibility: G52 relief valve compatible with Zodiac Polaris Pool Cleaner 180, 380, 280, 480 PRO, 3900 Sport, Vac-Sweep 380, Vac-Sweep 280, 280 TankTrax. New Upgrade: Compared with the previous relief valve, we have upgraded the shell material, made of crack-resistant polymer blend, which is more wear-resistant than the previous product, will not be easily damaged, and has twice the service life. Solve the problem: We have checked some common problems and made some improvements. In addition, if you encounter the following situations, it is stuck in the reverse position, the water is continuously discharged, it cannot work, and there is an omen of explosion; it may be that the gear is working. If it is caused by the dislocation in the middle, please open the case, check whether the external gear of the G53 is dislocated, and correct it. G53 gear mechanism: Made of wear-resistant and stable POM material, it can work continuously under ultra-high water pressure, but if there is too much sand, the gear will be stuck. At this time, you need to remove the grinding wheel to clean the sand and continue working. Do not mention: The continuous water spray of the buyer's feedback caused the Polaris floating problem because the local water pressure exceeds the adaptable water pressure too much, and we have made improvements.