I just spotted some interesting words here.. shut off valve?
How do I install shut off valve? what does it look like, does it sound more complicated on top of the regular installation?
the shut off valve is to the shower, not to the regular/cartridge (inside the hole) part, correct? If so, that is useless because that is where the problem may be.
Originally Posted by kok328
I don't understand why either but, that's just the way it is.
If something goes wrong with the installation, then yes, you will be without water in the entire house until you can make the repairs.
The only thing you can do is install shut off valves on the shower your working on so that the water can be turned back on without having the shower.
However, I suspect there is some type of code regarding the shut off valves on showers that we're not aware of.