Quote:
Originally Posted by retiredguy123
In my only experience with replacing a shower mixing valve, there is a large O-ring that prevents water from leaking inside the wall. If that O-ring is not seated properly or is defective, you can have a small amount of water that leaks inside the wall when you turn on the shower. This would cause a serious problem in the future. It is not an issue with sink faucets because you will see the leak. Also, with sink faucets, you do not need to turn off the water to the entire house. That is why I would hire an experienced licensed plumber to do the work.
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You can test and see if it’s leaking with cover off from wall so you can see shower valve body and line connections (which same thing plumber going to do). If person not confident/skilled best to call plumber.