Perfect compatibility: the ball bearing of the hose can be turned and replaced, perfect for 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 hose of the pool cleaner is made of high quality materials and has been rigorously tested by the manufacturer to prevent leakage. To connect 2 feed pipes together, 2 pipe nuts and 1 pipe rotary joint are required. Troubleshooting: 1) wear by rotation. 2) part of the seal leaks. 3) the pipe becomes rigid and can not rotate freely. Easy to install: pool cleaner hose is easy to install, quick to connect, saving time and money.Installation instructions: the arrow always points in the direction of the water flow. Water flows from the wall fittings through the pipes to the Polaris pool cleaner. The end of the tube can be softened by dipping the end of the tube into a container (pot or large insulated coffee cup) containing real hot water, allowing it to slide easily into the water. Pool Robot - Connector set with Polaris Hose 280, 380, 180 Pool Cleaner D20 Swivel & D15 Hose Nut & Swivel Hose Connector specification: name: Pool cleaning Hose Material: ABS packing list: 1 pool cleaning hose 2 hose nuts remarks: 1. Pool cleaner hoses are not compatible with Polaris 360 pool cleaners. 2. Due to lighting effects and shooting angles, there is color difference in the product, please understand. 3. Due to manual measurement, there is a tolerance in product size.