The Christmas Tree tubing adapter is used to connect the oxygen tubing to a oxygen concentrator or another DISS connector. The 1/4" barb hex nut adapter allows for the oxygen tubing to have a secure connection with the adapter. The adapter is universal and can be used with any standard oxygen tubing. Swivel hose nipple oxygen tubing christmas tree connector. Durable and easy to use for leak-free coupling. The swivel barb adaptor allows the user to switch their cannula from one oxygen source to another without having to remove the tubing from the hose barb.