SÜA Oxy-Fuel Torch Compatible Harris Check Valves Cutting Welding Heating Tip. This heavy-duty oxy-fuel torch is a high-quality die-forged brass unit compatible with Harris equipment. It works with E-43, E2-43, E3-43, and B-43-N mixers and uses Series 6290 cutting tips. The torch includes a 6290-1 acetylene tip capable of cutting up to 3/4 inch thickness, with thicker cuts possible using higher-number tips. Check valves are included for enhanced safety.