DESCRIPTION: Propane Bottle Adaptor / Fitting, 1-20 Male threaded x 1/4 inch FNPT (female), internal O-ring, NO check valve. FEATURES: Inlet: 1/4 inch FNPT. Outlet: 1 inch-20 Male. Features the type of OUTLET fitting you find on a disposable 1-lb propane bottle, sometimes referred to as a Colman or Primus type fitting. Inside is a nylon bushing and O-ring to seal to the nipple on diposable propane cylinder fittings or appliances. For example, # F-144 fits onto it. Straight Through Design, No Valve. All Brass.