In article , Eric R Snow says...

Something that really helps is having enough heat. A small flame will
overheat the valve. I use an air-acetylene torch for doing copper
pipe. It is more of a hassle lugging the little cylinder around, but
it makes the job way faster because the joint heats so fast.

I also prefer to use an MC sized cylinder and a small smiths
air/acet torch for this kind of stuff.

If you want to see soft solder fittings like that go on *real*
fast, use an oxyacetylene rig. With just about the smallest
tip you own.

Jim


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