4 Way CO2 Manifold with Integrated Check Valves and MFL Fittings Bundle by Kegconnection Includes threaded Checkvalve Check Valves are very important so you will avoid beer traveling through your beer system Made in the USA Comes with a set of 4 1by4 inches and 5 by 16 inches barbs white washers included to insure no metal to metal contact stops air loss FREE Kegconnection Keychain bottle opener