You will use 1 each of these ball-lock disconnects fittings. Black ball-lock will dispense the liquid out of the keg. Grey ball-lock will dispense the gas into the keg. These fittings can be easily transferred across kegs if you only have a single dispenser. NB Do not confuse which Plug Ball-lock these fit to, if it wont go on dont force it, it's probably the wrong fitting.