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I would like to change a tap located on the ground floor and I would like to know if it is necessary to drain the water coming from the floor (water heater upstairs) or if it is enough for me just to cut off the arrival of general water in order not to risk d flood

Close the main valve after the counter or the most tap faucet of the faucet you want to change. Open this tap and let the water flow. When nothing flows, replace your faucet.

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