HVAC tubing is typically smaller. For example, 3/4 water
copper is the same size as 7/8 HVAC tubing. But, it's
possible.

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Christopher A. Young
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"Bob F" wrote in message
...

IIRC, there may be fittings used for A/C systems or
something that are slightly
different sizes than water pipe fittings. They might be what
you need.