The Mr Heater 90 Degree Low Pressure Regulator with Appliance End Fitting and Acme Nut is most commonly used on propane gas grills. 3/8in Female Pipe Thread x Appliance End Fitting and Acme Nut. For Type 1 QCC-1 gas grill systems. QCC-1 fitting. 11 in W.C. regulator. 75,000 BTU max flow. Zinc construction.