This re-usable section of 3/16" tubing can be connected to the end of our Tubeless Cannula. Some users would like to have a Flow Control Valve connected to the end of this cannula to keep the Valve at chest level. It comes with a tubing clip to absorb the weight or drag of tubing. A male barbed connector mates with a female on the cannula. The barb can be removed turning the hose end to a female connection, if desired. This is not a requirement for use however. Your 50-foot extension hose can be connected to the cannula directly.