Nickel-plated brass tube with a free moving air regulator and serrated gas inlet nickel-plated brass tube, 9mm O.D. Base made of stamped steel sheet. Base dia 80mm and overall height 140mm approx. Powder coated or stove enamel finish. NATURAL GAS, 11mm dia tube L.P.GAS, 11mm dia tube NATURAL GAS, 13mm dia tube L.P.GAS, 13mm dia tube COAL GAS, 13mm dia tube.