This ball valve has a keg coupler thread and is used to stop beer flow from a standard keg coupler. This thread will not fit a 1/2" outlet.
This is a package of 5 buna gaskets for tri-clamps. Choose size 1/2" or 3/4" ID hose sizes below. These are the very same gaskets that you will find on most tri-clamp connections on Sabco equipment.