Turn off the main supply of water or gas at the point it enters your facility.

Start and stop flow on valves that don’t have handles. These wrenches have valve keys for three drive styles: 4-point socket, two prong, and open end. They’re often used on underground valves, such as those in waterworks systems, sprinkler lines, and supply lines for water and gas. The handle is wide enough to give you leverage to open valves but narrow enough to fit inside manholes and other tight spaces.

Snap the valve key to the end of the shaft. The other keys snap onto the ends of the handle for storage.

Use one end as a traditional pipe wrench and the other to loosen valve wheels. These are also known as engineers’ pipe wrenches.