AcmeNutx .25 inch InvertedMaleFlare. Connects to propane tank and auto cha...Acme Nut x .25 inch Inverted Male Flare. Connects to propane tank and auto change-over dual stage regulator. 1/4 inverted Male flare x Acme nut. Connects to a propane tank and an auto change over dual stage regulator. Regulator model (F273766). Hose...more