Before use, it should make clear following points Warning a) Except air and water (only special type and custom-design, e.g.: icemaker, refrigerator, cold water filter), never attempt to use the tube joint other fluids. b) The tube joint application is prohibited where spark and fire might be occurred. c) The tube joint application is prohibited if water temperature is above 60? (140?) because resin might be decomposed and damaged in water under a high temperature. d) The tube joint is not designed for application where there is static charge. e) Never apply tube joint with additional external load (bending, twist or pulling, e.g.: Trailer, Air Suspension), Cautions 1) If you use other supplier tubing, the different tubing tolerance might case leakage or incorrect connection and disassembly. It must check if tubing OD is measured by Metric Size or Inch Size. 2) Always check the end of tubing for a right angle cutting and check the external surface of tubing for any damage or scratch. Please refer to following instruction in connection of tubing. When you insert the air tubing into the joint, you will have two-step feeling. Section One is locking claw while Section Two is sealing ring. You must insert the tube into Section Two. Sleeve is used in tubing connection and disconnection. The sleeve is designed as an oval shape, which is convenient in assembly and disassembly. After connection of tube joint and tubing, always try to pull tubing and ensure its firm connection. 3) Cautions during disassembly of tubing before disconnection of tubing, always check tubing internal pressure for zero. For disconnection of tubing, always press sleeve heavily and then pull out tubing. If sleeve is net pressed with enough force, it is hard to pull out tubing and external surface scratch might be resulted by locking claw, which is the cause of air leakage.