Note that replacing a cartridge on a sink faucet and a shower mixing valve are 2 different things. You can turn off the water under the sink, replace the cartridge, and immediately see if you have a leak. But, for the shower mixing valve, you need to turn off the water for the entire house, replace the cartridge, and hope that you properly seated the o-rings inside the wall. If you didn't, water will leak inside the wall every time you turn on the shower. In my house in Virginia, I watched a master plumber damage 3 o-rings because of a defect in the cylinder inside the wall before he got one properly seated. I have installed several sink faucets, but I would not attempt to replace a shower mixing valve. Usually, when you need to turn off the water to the house, I will defer to a plumber.
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