G52 Backup Valve Replace Kit For Polaris Pool Cleaner Parts 180 280 380 480 3900Product Description:HIGH COMPATIBILITY: The replacement back up valve kit exactly fits Zodiac Polaris models 180, 280, 380, 480 PRO, 3900 Sport, Vac Sweep 380, Vac Sweep 280, 280TankTrax.FIX SITUATION: When the pool cleaner is entangled by obstacles or edges, it is difficult to turn over or float on the pool water surface, or even if the backup valve is still open and the water no longer sprays from the nozzle, you should consider checking or