Carefully screw the Adapter into the Full Flow Spigot ( you might want to put a few wraps of Teflon Tape for a better seal ). Screw the entire unit into the Threaded Seal ( hold the 'tab' of the Threaded Seal so it does not spin while screwing in the Full Flow Spigot.) Spin the Full Flow Spigot to a position so that it is easy to use.