If you re working on the actual tub shower control then you need to turn off the water for the house.
Water shut off valve for bathtub.
When working on the shower head tub spout that is all you need.
This shutoff valve will be either above or right behind the washer.
There should be a main control valve for the house or section of house that has your shower.
Shower bathtub some shower or bathtub shutoff valves may be underneath the sink but if they re not check in the basement if you have one directly below the bathroom.
Toilets on the other hand have a single valve to shut off the water as it is a household appliance that requires only cold water.
The first step is to physically search for your house s main water shut off valve on the inside of the home.
Some homes are equipped with branch valves that can be used to shut off the water supply to selected branch lines in the home.
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The second factor is if the tap leaks on a tub or shower it is not a catastrophic event.
Typically it will be located on the perimeter of the house since that is where the water first enters your house.
You can find this valve near the floor right under the water supply valve.
Utility or laundry room.
If not then you can always turn off the water at the street where your water meter is.
The tricky part is.
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The first is the desire and need to place plumbing in a wall for tub and shower.
With a sink or toilet or even a washin.
I think it has to do with two factors.
For example water pipes feeding outdoor hose faucets are very often controlled by in line valves that control only the pipes running to the outdoor faucets.
Three ways to quickly locate the water shut off valve find the water shut off valve on the inside perimeter.