Harris® E2-43 all fuel gases E-equal positive pressure torch mixer with 1/2" - 25 thread connection is compatible with Model 43-2 torch handle, Models T-43, 2393 tip tubes, Models 23A90 (13and15), 1390 (13), 1390-N (13and15) welding/brazing tips and Models J-63 (3and4), 1390 (3H), 2390-HandHPM (1-3) heating tips. It has a welding capacity up to 1" and heating capacity up to 590,000 BTU. This light-to-medium duty mixer is used for metal fabrication and shipbuilding applications.