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 feeding hoses together, 2 hose nuts and 1 hose swivel joint are required. Perfect Compatibility: The hose ball bearing can be rotated and replaced, which is completely suitable for Polaris pool cleaner 180, 280, 380, 480, 3900, replacement part number: D20, D-20 Note: for Polaris 360 POOL CLEANER is not suitable. Easy to Install: The pool cleaner hose is easy to install it is fast to connect, which saves time and cost. Solve Problems: 1 Rotating wear. 2 Part of the joint is leaking. 3 The hose becomes stiff and cannot rotate freely. Installation Tips: The arrow always points in the direction of the water flow. The water flows from the wall fittings through the pipes to the for 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 cup containing real hot water, making it easy to slide into the device.