Perfect Compatibility: 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 CLEANERis not suitable). Quality Enhancement: The pool cleaner hose is made of high quality materials and has been rigorously tested by the manufacturer to prevent leaks. To connect 2 supply pipes together, 2 pipe nuts and 1 swivel jointof hose are required. Solve problems: 1) Rotating wear. 2) Part of the gasket is leaking. 3) The pipe becomes stiff 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 pipe end can be softened by immersing the pipe end incontainer (pot or large insulated coffee cup) containing real hot water, which makes it easy to slide it into the device. Easy to install: The pool cleaner hose is easy to install, quick to connect, saving