Note: outer diameter:22mm, length:18.5inches; Should connect with a 22mm(inner diameter) hose before connecting the machine. Our tubing is protected by Pat. USD1035861S. 360-Degree Rotation: IBEET short tube assembly provides 2 very nice 360-degree "spins" for the hose. Swivels and seals correctly, helping pivot the tube and keeping it more comfortable when sleeping. Easy to install and use. Keep The Air from Leaking: Our elbow can be easily connected to your tubing, effectively preventing air leakage and hissing noise to improve sleep quality. Convenient & Flexible for Using: The length of our short tube is longer than the original one, which allows you to move more flexibly and conveniently during use so that you can easily get a more comfortable night. Quick Release: The elbow is quick release and easy to achieve a tight connection. If you got up and tugged in an emergency, you could pull it out of the hose without damaging the end of the hose. Package Includes:1 PCS Short Tube, 1 PCS Elbow, and 1 PCS Swivel. Includes 1 piece of replacement tubing supplied by IBEET.