KOMOS® Stainless Steel D-Style Keg Coupler (With PRV) 1/4 in. Barb Connectors Included1 4" tailpieces are ideally used with 3 16" draft line for a tight fit. If you'd prefer to use a different size tubing, the KOMOS coupler can also be purchased bare so you can mix and match your preferred tailpiece sizes. The check valves will need to be installed before first use. The silicone check valve is inserted on the side gas in port and the check ball and ball retainer are inserted on the top bev out port. D style sanke coupler Stainless body