Universal Wall Fitting Ector: 9-100-9001 Universal Wall Fitting Ector Set Compatible with Polaris 280 380 180 180 91009001 Robot Tail Foam Brush Perfect Compatibility: Scrubbers replace Polaris (parts 9-100-3105, 91003105), perfectly fit Polaris, Vac-Sweep pool cleaners or automatic vacuum cleaners, including Polaris 180, 280, 360, 380, 480 and 3900 Sport Universal wall connector plug Also fits for Zodiac Polaris pool cleaner models 480 PRO, 3900 Sport, Vac-Sweep 380, Vac-Sweep 280, 280 TankTrax Compatible with Polaris Zodiac 180 280 380 480 3900 robot The blue and red restrictors/pressure discs are used to slow the flow of water.They allow you to adjust the speed at which the cleaner moves across the bottom of the pool.They are inserted into the quick coupling