This is the larger barb size to fit the larger gas side tubing that some system come with. The barb is too big to fit our 1/4" braided gas line. If you are looking for a Swivel Nut to fit 1/4" tubing Click Here.

Easily add a threaded fitting to your 5/16" ID or 3/8" ID tubing for quick connecting, disconnecting and fast "switch-outs"
The 1/4" FFL fits all 1/4" MFL fittings. If you are fitting to brass or other metal, you may want to add in a plastic insert for a good seal. 

Set includes 1 nut and 1 barb.