On Sep 13, 6:13*pm, "MiamiCuse" wrote:
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

Your chances of making an exact and neat round 7" hole in a concrete
block is just about zero. That size cuts into both the top and bottom
webs plus at least one of the block webs that goes between the sides.
Might be possible with a big 'core drill' but you won't find one at
your local rental outfit. Basically you are talking about removing
half of a block. Drilling with a hammer drill won't get it.

Your choice is to break out half of a block and then 'neaten it up'
somehow.
Harry K