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I've done more copper plumbing than I care to admit.
I've found that MAPP is only good for the big fittings. 1" and bigger. Or just turn up the knob on the propane.
On 1/2" and 3/4" I've found that you'll more easliy overheat the pipe/flux with MAPP and that causes problems ( leaks ).
Once you've got the whole run dry-fit, just use your propane torch ( on low ) and sweat it together.
Most plumbing contractors use propane in a bigger tank with a long hose to the torch.
Ask them...
MAPP is hype. Bigger, better, hotter, faster...
KT
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'74 914-6 2.6 SS #746
'01 Boxster
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