Harris® T-43 natural gas/propane curved welding/brazing tip tube with 3/8" - 24 thread connection is compatible with Models 15-5, 19-6, 19-6A, 50-9, 50-10 torch handles, Models B-15-3, B-15-3F, H-16-E, H-16-S mixers, Model 1390, 1390-N, 8490, 8490-N welding/brazing tips and Models 1390-H, 1390-HA, 1390-3H, 1390-B heating tips. This 9.8" long tip tube is used for production brazing, arts and crafts, HVAC, maintenance and other applications.