2 Polaris 9-100-9002 Pool Cleaner 180 280 380 Pressure Relief Valves 91009002 Pack of TWO (2) Pressure relief valve replacement 9-100-9002 Fits Zodiac Polaris pool cleaner models 180, 380, 280 OEM Polaris parts in original Manufacturer package Also fits Zodiac Polaris pool cleaner models 480 PRO, 3900 Sport, Vac-Sweep 380, Vac-Sweep 280, 280 TankTrax