There should be a main control valve for the house or section of house that has your shower.
Water shut off valve for bathtub.
Compression outlet 1 4 turn angle valve.
And then there s the shower water.
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These valves will be located along the main branch pipes and are located in accessible utility areas.
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Typically it will be located on the perimeter of the house since that is where the water first enters your house.
This shutoff valve will be either above or right behind the washer.
When working on the shower head tub spout that is all you need.
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.
Utility or laundry room.
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.
With a sink or toilet or even a washin.
I think it has to do with two factors.
If you re working on the actual tub shower control then you need to turn off the water for the house.
In this case the water valve is around the shower through an access panel.
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The second factor is if the tap leaks on a tub or shower it is not a catastrophic event.
The tricky part is.
If not then you can always turn off the water at the street where your water meter is.
Three ways to quickly locate the water shut off valve find the water shut off valve on the inside perimeter.
Some homes are equipped with branch valves that can be used to shut off the water supply to selected branch lines in the home.
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.