The answer to 'how long does shut-off valve last' is that a properly installed and maintained shut-off valve can typically last 20-30 years or more. Shut-off valves are essential plumbing components that allow you to turn off the water supply to a specific fixture or the entire home in case of a leak or other plumbing emergency.
The lifespan of a shut-off valve depends on several factors, including the quality of the valve, the water pressure and mineral content in your home's water supply, and how often the valve is used. Valves made of high-quality brass or stainless steel tend to last longer than cheaper plastic or low-grade metal valves. Regular use and maintenance, such as occasionally turning the valve to keep it operating smoothly, can also help extend its lifespan.