Kegco BF Swivel Nut Set for MFL 5/16" swivel with hex nut Use this setup to easily connect/disconnect your line from a home brew coupler 5/16" Barb to 1/4" (MFL) Swivel Nut is used to connect hose to 1/4 threaded MFL Keg Connection 1/4" MFL Beer Tailpiece 5/16" Barb Stem x 1/4" FFL Nut Swivel Set (Air Line) Home brew Kits and accessories