This is a 45-port round torch with a second on top. The bottom is configured as a center ring of 16 ports, surrounded by a ring of 27 ports. Flame width can be up to 1.25 inches. The topfire can be either pre or surface mix. The premix option includes a top-mounted burner with interchangeable N11 and N3 tips. Use 3/8 inch or 5/16 inch hoses.