2 Way CO2 Manifold with Integrated Check Valves and MFL Fittings Bundle by Kegconnection,Copper Set Includes: 2 Way CO2 Manifold with Integrated Check Valves and MFL Fittings, (2) 1/4 inch Barbs; (2) 5/16 inch Barbs; (2) Swivel Nuts, White Washers; and a Kegconnection keychain bottle opener. Integrated check valves help prevent beer back flow (via the CO2 connection) from one line to another. This allows you to split a single CO2 output (from a primary or secondary regulator) into (2) runs. The 1/4 inch barbs; 5/16 inch barbs; and swivel nuts allow this air distributor to be used with 1/4 inch or 5/16 inch ID Lines. (ID Lines Not Included) The white washers help ensure there is no metal to metal contact, which prevents air loss. Set assembled in USA. Shipping rate is for the Continental US ONLY