Water shut-off valves allow you to control the water flow directly to your fixture. If your water shut-off valves are dripping and you can't get it to stop, you may have to replace it with a new one. We start by shutting off the main water supply. We remove the old valve, clean the pipe, install a new valve, and then turn the water back on and turn it on to test it for leaks. There are multiple types of valves based on the type of pipe you have.