This is the 1/4" male end of the clear Polycarbonate quick twist disconnect tubing barb/connector with specially designed tapered flair single barb on each end. It will mate with the female end of the full disconnect we have in our other listing. We had several requests for these in the 5/16" to 5/16" version. This is a modified Luer Lock style connector and is compatible with our other Quick Disconnect hose barb adapter. The male and female ends of both sizes are compatible with one another and interchangeable.