the silver valve on the wall(1 hot 1 cold) under the sink has the house water pressure on it(in the wall) the water stops from that shut off up to the faucet
If you are removing the supply valve from that faucet, you may need to turn off the whole house water at the meter. You could then replace the supply valve and turn it off until you are finished with the faucet install. There would still be water laying in the lines so you may want to drain it down through an outside faucet since they are usually the lowest point.
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