What's the water meter key for?

A tool for turning on and off the water meter. When the water level rises to the control line, the float rises, touches the lever, closes the pilot hole, and the valve cavity begins to fill with water, sealing the sealing surface of the control valve, and the control valve immediately stops supplying water. The water meter key is a tool to open and close the water meter. Keys are common unlocking tools in people's lives. The main materials for making keys are copper, zinc, aluminum, iron and other metals. There are many kinds of keys, including ordinary keys, intelligent key, remote control keys, electronic keys and so on.