The valve makes it possible to dry hop with a regular soda bottle on a FermZilla. You put some hops in a threaded bottle, attach the valve, and put it onto the lid of the FermZilla. An easy and cheap tool for dry hopping.If you also use a Carbonation Cap T-Piece and a Line Cleaning and Carbonation Cap you will be able to use Co2 to remove the oxygen from the hops.Stainless steel ball valve with a approx. 20 mm bore and O-ring in both ends.