Turn off the
water supply
1
Find the water supply valve
Locate the water supply valve by tracing the hose from the bottom of the tank to the wall.
2
Turn the water off
Turn the valve clockwise as far as it can go to stop the flow of water.
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The valve should be relatively easy to turn so don't force it if it feels stuck.
If your valve won't turn
You might be dealing with rust or calcification. Try twisting it side to side gently. If needed, use white vinegar to dissolve the rust/mineral build-up.