Perfect Compatibility: Hose ball bearings can be rotated and replaced, Perfect fit for Polaris 180 280 380 480 3900 Pool Cleaner Part number: D20, D-20 (Note: not suitable for Polaris 360 POOL CLEANER). Quality improvement: The pool cleaner hose is made of high quality materials and has been strictly tested for leaks by the manufacturer. To connect 2 supply hoses together, 2 hose nuts and 1 hose swivel are needed. Troubleshooting: 1) Rotating wear. 2) Part of the seal is leaking. 3) The hose becomes rigid and cannot rotate freely. Installation Tips: The arrow always points in the direction of water flow. Water flows from the wall fittings through the hoses to the Polaris pool cleaner. The end of the hose can be softened by submerging the end of the hose in a container (pot or large insulated coffee mug) of real hot water so that it can be easily pushed into the water. #39;Device. Easy to install: The pool cleaner hose is easy to install, quick to connect and saves time and money.