Mr. Heater F271158-36 3-Foot Propane Hose Assembly with Acme Nut and a 1/4'' inverted Male flare Acme Nut x .25 inch Inverted Male Flare Connects to propane tank and auto change-over dual stage regulator Hose material stretch tested to 400 psi Hose material pressure tested to 600 psi Solid brass fittings