1. This elbow series product does not contain any components and can be directly used in copper-forbidden environments;2. It has multiple specifications and is willing to be used in various oxygen and oxygen systems;3. The circulation performance is improved, and it can control the flow of the same capacity in the radon pipe;4. It is convenient and quick to unplug and plug in the pipe, and the quick connection part of the pipe is safe, reliable and durable.