Make your propane tank more versatile with this Mr Heater Bulk Adapter with Acme Nut x 1 20 Male Fitting Features . Acme Nut X 1 Inch 20 Male Throwaway Cylinder Thread. Most Commonly Used To Hook Portable Appliances To New Propane Tanks. Can Be Used with Qcc 1 Fitting. Has Excees Flow Check Valve. Propane Bulk Cyl Adapter W Appliance End Fitting Acme Nut