UWF Disconnect Assembly: Universal D29 quick disconnect wall adapter compatible with Polaris 180, 280, 380, 480 Pro, 3900 Sport pool cleaners. 9-100-9002 Pressure Relief Valve: Compatible with Polaris models 480 Pro, 3900 Sport, Vac-Sweep 380, Vac-Sweep 280, 280 TankTrax pool cleaners. High Quality These parts are made of durable and wear-resistant ABS plastic and well tested by the manufacturer which ensures high durability and long . Great Function: 9-100-9002 Pressure Relief Valve: When the pressure inside the line exceeds the spring tension, the spring opens and relieves the excess pressure. Fully screwing can provide the maximum amount of pressure and acceleration; D29 UWF Quick Disconnect: It is the main body of the wall adjustment that makes a rotation lock on the pool wall. It is not manufactured or sold by Polaris but has the same performance as the original. Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may