This is the UWF Universal Wall Connector to replace part # 9-100-9001 Compatible with Polaris Zodiac 180 280 380 480 3900 Pool Cleaners Easy to install, just screw on the Polaris hose The blue and red pressure discs are used to slow down the water flow. They are used to adjust the speed that the cleaner moves across the pool floor. They are inserted onto the quick disconnect Package Contents: 1 x Water Hose Connector, 2 x Limit Plates, 2 x Sponges Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.