A shutoff valve connects to copper plumbing pipes in one of two ways: Compression fitting; Sweat fitting. Identify the connection type used in your home by referring to the photos below.

If the valve is required to shut off against high system pressure, extremely large stem torque (closing force ... depending on valve size, of the torque that would be required if this design was not ...

However, the cost of main water shut-off valve replacement can vary quite a bit, depending on the size of the valve and its location. A faulty water shut-off valve can create all sorts of problems ...

Severe-service shutoff valves can be equipped with additional features such as locked bonnets, nonrotating stem tips, and high-temperature packing materials. They range in size from 0.0625 to 4 in.