This size eight, type four, welding and heating tip is made for use with natural gas and propane and includes a mixer and nut. It has a steel thickness of 1 1/2 to two inches, a fuel pressure of 12 PSI, an oxygen pressure of 18 PSI, and an acetylene pressure of 12 PSI. It is made for use with welding torch series WH360, WH360L, 72L9, and 72L11.