This YaeBrew CO2 gas manifold can be used in commercial beer systems & breweries, it converts one gas source to two kegs/lines, for more kegs, you can add multiple manifolds together.
Each line has its own shutoff valve.
No need check valve because there is built-in check valve in the beer couplers, which eliminates check valve failure
this professional quality manifold without a check valve, is a key to dispensing the best draft beer.