Perfect compatibility: the hose ball bearing can be rotated and replaced, which is a perfect fit for Polaris Pool Cleaner 180, 280, 380, 480, 3900, 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 strictly tested by the manufacturer to prevent leakage. To connect 2 supply pipes together, 2 pipe nuts and 1 pipe arch are required. Solving problems: 1 rotating wear. 2 part of the joint is the leak. 3 The hose 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 end of the hose can be softened by immersing the end of the hose in a pot container or a large insulated coffee mug containing real hot water, which makes it easier to slide into the device. Easy to install : The pool cleaner hose is easy to install and quick to connect, saving time and cost.