So you had the great foresight to buy our modular gas line manifold and now you are adding a keg. You need gas on that keg. No problem, use our add on assembly to expand your existing manifold. Includes a shut off check/ball valve, one tee and a connecting nipple. The barbs are all 5/16", standard for gas line in the beer industry. Non-pressure tested, it is advised to preform a leak test prior to hooking up gas line to insure no leaks.