The master valve that shuts off all water to the entire building — the first thing to turn in a plumbing emergency.
The valve that controls the flow of water to the entire building, located at the point where the water service enters the structure. Turning off the main shutoff valve stops water to all fixtures and equipment, essential for emergency leak control and major plumbing repairs. It must be readily accessible and clearly identified.
The main shutoff valve was relocated from the utility room to an accessible location near the building entrance for emergency access.
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