Model 5090 tips are manufactured using environmentally-friendly tellurium copper that has excellent machining properties resulting in a higher quality tip. They are swaged for more precise and consistent flames. They use a universal mixer for sizes 1 to 5, eliminating the expense of using a different mixer for every tip size. All 5090 tips have a metal-to-metal mixer seat virtually eliminating the possibility of leaks and the need for thread sealants when used with Harris mixers.Welding and brazing tip size #3To be used with acetylene gasesPerfect for HVAC tubing up to 1/2 in., and plumbing tubing up to 3/4 in.Can weld metal up to 1/16 in. thick