Gas Gate Valve Extension The Gate Valve Extension (GVEXT) enables the operation of deeply buried valves with standard length gate valve keys. The GVEXT consists of a shank with a 2" valve operator on the top and a 2" socket on the bottom. The bottom of the GVEXT is placed on top of a deeply buried valve. The extension can be left in place and operated as needed. A centering ring (optional) is attached to the shank of the extension to keep it centered in the valve box. The weight of the extension will hold it into place. Set screws are available to secure the GVEXT to the valve on new installations. To be used only with non rising valves.