Flow Control Shank Adapter Changes any faucet into a flow control faucet Simply add this adapter in between your tap and shank, then you can adjust the flow with an allen wrench. Once adjusted, the flow is locked in and cannot be accidentally changed. This adapter will fit most shanks. To make adjustments, first loosen the top and bottom hex head screws with the allen wrench. Turn the middle ring to adjust flow restriction. Open your faucet to test the flow restriction and make further adjustments if needed. Once the desired restriction is dialed in, retighten the top and bottom screws. Does not include the body gasket for connecting the adapter to the shank. Please note: the shank collar and small adjustment screw are made from chrome plated brass. All other parts are made from stainless steel, including all parts that come into contact with liquid.