The Duke 213533 Gas Burner provides a gas-fired burner assembly for compatible commercial cooking equipment. This brass burner includes a cap, #77 orifice, 2-3/8-inch overall dimension, 1/16-inch MPT connection, six slots, four air holes, and a 3/4-inch diameter. The orifice meters gas into the burner while the air openings support the gas-air mixture required at the burner ports. https://partsfe.com/gas-burner-7734-brass-for-duke-part-213533