Tom, what torch handle do you have? G-tec is a company that provides equipment to use natural gas as a fuel. They have a unit that can take the low natural gas pressure coming into a building and increase it so the torch can function normally. These are great for schools for example. Propane works in a similar way to natural gas.

Yes, a mixer is needed to mix fuel and oxygen together. If you have a Victor J-28 torch handle that mixer for Propane it is a UN-J. G-tec also makes a mixer for Victor torch handles. It makes one for the Smith AW1A handle too. If one has a AW1A, the easiest way to get propane tips to work with it (Smith tips are useless) is buying their mixer for a Smith and also one of their elbows to match (they come in different lengths). Just to be clear one has to buy a mixer and elbow separately when buying from G-tec. The Victor UN-J already comes as one unit.

In prior discussions multi-port tips work better than single orifice tips because they are less likely to blow out and the G-tec multi-port tips put out more volume for brazing with brass. G-tec tips have Victor threads (5/16” – 27 tpi). That is a proprietary size. I often use the Victor single orifice TEN tips because they work just fine. G-tec sells both single and multi-port tips.

Just to be obnoxiously clear, if you have a Victor J-28 torch handle or a Uniwield 71, you need to buy the Victor or clone UN-J mixer elbow in order to use the G-tec multiport TEN #3 tip. .