Our house has great water pressure except for the shower stall that we use most often. There are no obvious visible valves by which to turn it up. Does anyone know where they might be? Hidden within the walls perhaps? Our house is about 60 years old, single wall construction. Our plumber says he’s too busy to deal with this!
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Copper or cast iron pipes?
or combination of both?
With iron pipes they can become "clogged" and thus reduce in inside diameter. Just a thought.
If at first you don't succeed...try again! After that quit! No sense being a dam fool about it! W.C.Fields
Well besides the possibility of clogged iron pipes (which would probably show up in other locations) the most likely problem is in the shower head.
Have you removed it and checked for buildup and junk.
What has already been said are the most likely causes. It could also be debris clogging the control valves.
I had a house in which the only thing in the house with low flow was one shower. It had a cartridge type mixer that was clogged with rust (40 yr old steel pipes). It was a bear to get out. Moen lists a cartridge removal tool, but I don't know if it works with cartridges other than Moen's. Might be other removal tools out there.
If the shower head has been replaced somewhat recently it could have a flow restrictor to save water. It's usually a white plastic washer that can be removed.
Smile. It could be worse. You could be me working for you.
"usually a white plastic washer that can be removed"
most I've seen recently are a lot more complex than a simple washer, lotsa'em now need to be drilled out in more than one location, some even have a spring/pressure regulator internal valve that needs to be removed.
On the same subject, whoever came up with the 2.1 gpm regulated kitchen faucets when all used to and some of plumbing codes 'still' require 6gm capability???