Compatibilty G52 Backup Valve fits Zodiac Polaris Pool Cleaner 180, 380, 280, 480 PRO, 3900 Sport, Vac-Sweep 380, Vac-Sweep 280, 280 TankTrax.Fix 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 casing, check whether the external gear of G53 is dislocated, and correct it.New UpgradeCompared with the previous backup 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 life span.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 point, you need to remove the grinding wheel to clean the sand to continue working. Don't mention: the continuous water spray from the buyer feedback caused the problem of Polaris floating because the local water pressure exceeded the adaptable water pressure too much, and we have made improvements.After-sales service: lifetime warranty! You can reduce the excessive worry about product quality and service, because if you have any questions about the G52 spare valve you received, as long as you give us feedback, we will reply to you within 24 hours. Please rest assured to buy. We are always loyal to our customers.