1/4 Inch NPT x 6.35mm (1/4") Barbed or MFL Threaded Valve with Check Valve

These ball valves include a built in check valve to not only protect your regulator but also prevent gas or beer migrating from one keg to another
 
The manifolds we sell all come standard with 2, 4 or 6 output. These can be converted to 3, 5, or 7 output by simply unscrewing the 1/4 inch plug from the end of the manifold and inserting one of these 1/4 inch ball valves