1.WHAT YOU GET: 1 x G52 Back Up Valve Kit, including G53 Gear Mechanism, G54 Outer Casing and G57 Outer Ring. This item is also suitable in saltwater pools. 2.IDEAL REPLACEMENT PART: G52 Backup Valve is made exactly fit for Zodiac Polaris Pool Cleaner models 180, 280, 480 PRO, 3900 Sport, VacSweep 280, 280 TankTrax. 3.PROVIDE A BACKUP AND REVERSE MECHANISM: G52 Backup Valve Kit Replacement provides a backup and reverse mechanism for your Polaris Pool Cleaner. It operates in conjunction with the pool cleaner's internal mechanisms and helps ensure proper pool cleaning coverage. 4.PREVENT ANY STOPPAGE: G52 Backup Valve Replacement activates to reverse the direction of the pool cleaner. The valve opens every 3 minutes for 30 seconds, allowing the cleaner to change its cleaning path, preventing it from getting stuck in corners or on obstacles. It helps ensure comprehensive cleaning of the pool surface and efficient debris removal. 5.PREMIUM QUALITY: G52 Backup Valve is made of a sturdy and wearresistant polymer blend and has a durable construction, reducing cracking on the valve case and ensuring the valve's longevity and functionality in the pool environment. 6.EASY INSTALLATION AND REMOVAL: G52 Backup Valve allows for effortless attachment and detachment, making installation relatively easy.