Polaris Zodiac 360 In-Line Backup Valve (9-100-1200) underwatermagic An O-ring is useful because

An O-ring is useful because it helps create dependable leak protection at the cover connection while supporting cleaner and more reliable reassembly

and stronger long-term service confidence

A properly selected Pleatco grid helps preserve original fit and contributes to more reliable filtration performance after service

Useful when the original fan is weak or failed

and the notched design supports compatibility in installations that call for that specific control format

Polaris Zodiac 360 In-Line Backup Valve (9-100-1200) underwatermagic An O-ring is useful becauseThe Polaris Zodiac Backup Valve [360 In Line] (9 100 1200) is a replacement backup valve for compatible Polaris and Zodiac pressure side pool cleaner systems. This component helps the cleaner periodically reverse direction and free itself from obstacles, helping the cleaner maintain reliable movement throughout the pool. A failing backup valve or related backup valve part can cause the cleaner to stall, stay in one area, or lose the movement pattern