The Mr Heater Propane Adapter Tee allows the convenience of using your camper LP supply for lanterns, tabletop BBQs, etc. at parks, campsites, rest stops, etc. Excess Flow Soft Nose P.O.L. x 1in - 20 Throwaway Cylinder Thread x Female P.O.L. with Acme Thread. Use with hose assy. F273710-11 and F273701-02. Has brass nipple to open safety valve in male throwaway cylinders. Has rubber gasket for sealing. Soft Nose P.O.L acts as secondary seal.