Universal Wall Fitting Set: D29 quick disconnect wall adapter compatible with Polaris 180, 280, 380, 480 Pro, and 3900 Sport pool cleaners. 9-100-9002 pressure relief valve compatible with Polaris 480 Pro, 3900 Sport, Vac-Sweep 380, Vac-Sweep 280, and 280 TankTrax pool cleaning models. High quality: These parts are made from durable, wear-resistant ABS plastic and thoroughly tested by the manufacturer to ensure long-lasting performance. Key functions: The 9-100-9002 pressure relief valve opens to release excess pressure when internal line pressure exceeds spring tension. Fully tightening provides maximum pressure and improved flow. The D29 UWF quick disconnect is the main wall fitting that enables secure rotational locking into the pool wall. Note: This product is not manufactured or sold by Polaris but offers performance equivalent to the original equipment.