What you get - 1 x G52 Back Up Valve Kit (includes G53 Gear Mechanism, G54 Outer Casing, and G57 Outer Ring) - Suitable for saltwater pools Ideal replacement part - Precisely fits Zodiac Polaris Pool Cleaner models 180, 280, 480 PRO, 3900 Sport, Vac-Sweep 280, 280 TankTrax Backup and reverse mechanism - Provides a backup and reverse function, working with the cleaner's internal systems to ensure proper cleaning coverage Prevent stoppage - Activates to reverse the cleaner's direction - The valve opens every 3 minutes for 30 seconds to change the cleaning path and prevent stalling in corners or around obstacles Premium quality - Made from a sturdy, wear resistant polymer blend for durable construction in pool conditions Easy installation and removal - Simple attachment and detachment for quick maintenance Use scenarios - Regular maintenance for pools with irregular shapes or many obstacles to ensure continuous cleaning - Saltwater pools where corrosion resistance is important - Replacement during Polaris cleaner service to maintain performance