When I was plumbing I used a very expensive machine that couls pull a

nice port in a large diameter copper pipe. The thing paid for itself the
first week we used it. Instead of cutting a supply line twice and installing
and adapter, we drilled a small hole in the line and inserted this gizmo
that had expanding dies with rollers. It would expand the hole while pulling
the spinning rollers out of the hole and made a nice spigot you could sweat
in a new copper line.

Lynn

If you can get it to work on the material you are using, it sounds like a

winner. The larger the radius the better, but any radius is better than a
square corner.

Thanks Lynn,
George (down under)

 
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