High-quality, American-made burner with nickel-plated, die-cast zinc bases. Burner feature aluminum mixing tube and 5/16″ serrated gas inlet connection. 7/16″(11mm) Mixing Tube OD, 0.55 CFH, 1,342 BTU Output, 5-3/8″ (137mm) Overall Height. CFHs and BTU Outputs are figured on: 5 inch Water Column Pressures for Artificial and Natural Burners. 11 inch Water Column Pressures for LP Burners.