DIY Frequently Asked Questions / Propane Fuel
- DIY Frequently Asked Questions / Propane Fuel')"> Attaches to a propane torch.
- Propane comes in bright blue tanks and MAPP welding gas comes in yellow tanks.
- Propane is generally used to heat copper for flaring. However, sometimes there is water in the line that needs to be evaporated so the pipe will heat enough to sweat a joint. Use MAPP gas, but use caution as too much heat can melt the pipe.