This 20 mm speed-fit Male threaded adapter water pipe connector / joiner is meant for PE hoses/tubing. It permits easy disassembly as well.Delivery includes 2 x Male threaded adapter Connector.Installation instruction:1. Cut the tube at a right angle and remove any irregularities. Grease both the tube and the connector.2. Loosen the nut 3-4 turns.3 .Push the tube fully into the fitting until the tube stop and make sure that the tube is inserted through the sealing element.4.Tighten the nut with a chain wrench or strap wrench.5. Pull on the tube to check if it is secure. Test the system before use.