The answer to 'what is shut-off valve' is a shut-off valve is a valve that controls the flow of water or other fluids in a plumbing system. It is used to turn the water supply on and off, typically located near fixtures like sinks, toilets, and water heaters. Shut-off valves allow homeowners to isolate and shut off the water supply to a specific area of the home, which is important for making repairs or preventing water damage.
Shut-off valves are usually made of brass or other durable materials and can be either manual (turned with a handle) or automatic (controlled by a switch or sensor). They are an essential component of any plumbing system and should be regularly inspected to ensure they are functioning properly.