The answer to 'what causes shut-off valve' is a shut-off valve can malfunction or become stuck for several reasons, including mineral buildup, corrosion, or physical damage. Over time, the valve components can wear out, preventing the valve from opening or closing properly. This can happen gradually or suddenly, leading to water leaks or the inability to turn the water supply on and off as needed.
Shut-off valves are an essential plumbing component, allowing homeowners to isolate water flow to specific fixtures or appliances for repairs or maintenance. Proper maintenance and periodic inspection can help prevent shut-off valve issues and ensure they function reliably when needed.