Compatible model: G52 valves compatible with Zodiac Polaris 180, 280, 380, 480 PRO, 3900 Sport, Vac-Sweep 380, Vac-Sweep 280, 280 TankTrax models. Upgraded Version: Compared to the previous valve, our G52 valve replacement kit for improved shell material, crack-resistant polymer construction, won't be easily damaged, and has twice the life of life. Function: The upgraded version will solve the problem when your pool cleaner is stuck on an obstacle, although your emergency valve is still open, water will no longer be sprayed from the nozzle, and will keep water outside. Contents: 1 G52 valve replacement kit. Product description Quantity:1 G52 Pool Cleaner Relief Valve Replacement Kit, Fits 180, 280, 380 Pool Cleaner, Revised for Crack Resistant Housing,