These are Krome brand chrome plated brass ball valves for use with regulators, manifolds or any other gas distribution need. These come with a built in check valve which prevents any liquid from passing through it, which could damage regulators.
Three types currently available include:
1/4 inch male NPT with 1/4 inch MFL out connection (for connecting tubing using swivel nuts)
1/4 inch male NPT with 3/8 inch OD barb out
1/4 inch male NPT with 5/16 inch OD barb out