Famous Main Water Valve In Home Is Dripping References. Homeowners with basements, check there first! The packing nut is responsible for making a watertight seal where the valve stem meets the.

A main water valve may start to leak around the gate valve stem after opening and closing the valve. Open all fixtures to see if the water is dripping from anywhere else and flush toilets. Problem is, with the main water valve shut off, there's still a trickle of water coming out of my upstairs faucets.