Perfect Fitment: Hose ball bearing can be rotated and replaced, perfect fit for Polaris 180, 280, 380, 480, 3900 Pool Cleaner, Replacement Part Number: D20, D-20 (Note : for Polaris 360 POOL CLEANER is not suitable). Quality improvement: The pool cleaner hose is made of high quality materials and has been rigorously tested by the manufacturer to avoid leaks. To connect 2 supply hoses together, 2 hose nuts and 1 hose swivel joint are required. Solve problems: 1) Rotating wear. 2) Part of the gasket is leaking. 3) The hose becomes rigid and cannot rotate freely. Installation tips: The arrow always points in the direction of the 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 immersing the end of the hose in a container (pot or large insulated coffee mug) containing real hot water, which allows it to be easily slid into the appliance. Easy to install: The pool cleaner hose is easy to install, quick to connect, saving time and money.