Rent an diamond grit concrete hole saw, Home depot and others have them.

Sal

"MiamiCuse" wrote in message
...
I have to install an outdoor shower for a rinse off to the pool. The
shower valve has a solid brass body and I have to cut a hole about 7" in
diameter to recess the valve into it.

How can I cut a 7" diameter for this? The trim is not much bigger so a
clean cut would be necessary. My thinking is that I draw the outline on
the concrete wall, then drill holes (many holes) along the perimeter using
a hammer drill. Any other ideas greatly appreciated.

MC