An automatic water shutoff valve is a motorized valve on the main line that closes when a leak sensor gets wet or water flow looks wrong, so a burst pipe in an empty shore house loses gallons instead of thousands; it is installed by a licensed plumber.
By the Shore House Pipes editors · sources checked October 31, 2026 · how this manual is written
A leak sensor tells you; a shutoff valve acts. In a house nobody visits for weeks, the hours between an alert and someone arriving are when the damage happens.
Ask the plumber whether the valve fits the size and type of your main, where the motor will sit relative to the flood level, how it reports (Wi-Fi, a hub or cellular), and what it does when the power or internet drops. Ask, too, whether the irrigation line and outdoor shower are fed before or after it, because anything fed before the valve stays live when it closes.
No. On a house with the heat on, it limits damage. On a drained house the main is already off.
From the Moen YouTube channel. The still picture is stored on this site; nothing loads from YouTube until you press play. The video's advice is the channel's own; where it differs, this page's safety steps come first.
Each source was opened and the cited figure or sentence checked on October 31, 2026. Steps marked PRO are described, not taught: they belong to a licensed plumber or the utility.