PERFECT: The ball bearing of the pipe can be turned and replaced, which is perfect for the Polaris 180, 280, 380, 480, 3900 pool cleaner, spare part number: D20, D-20 (Note: For Polaris 360 Pool Cleaner is not suitable). Quality Improvement: The pool cleaner pipe is made of high quality materials and has been rigorously Tested by the manufacturer to avoid leaks. To connect 2 power hoses together, 2 hose nuts and 1 hose swivel seal are required. Solve problems: 1) Rotating wear. 2) Part of the joint flees. 3) The pipe becomes rigid and can not run freely. Installation tips: The arrow always points to the flow of water flow. Water flows from wall fittings through the pipes to the Polaris Pool Cleaner. The end of the pipe can be softened by immersing the end of the pipe in a container (pot or large isothermal coffee cup) containing actual hot water, which makes it easy to slide it into the unit. Easy to install: The pool cleaner pipe is easy to install, it is quick to connect,