I also have this 4-in-1 tool in my CERT bag. It worked great in training. One day I was about to do a minor plumbing job at the house and tried to use it on the water valve next to the water meter (in a box in the ground). The valve would not move. I attached vice grips to the 4-in-1, but that did not provide enough leverage. I tried other makeshift tools but to no avail. I finally called the water department, who sent out a nice guy with a "T" tool about 4-feet across. Even with that amount of leverage, it still took us both to finally close the valve. The water guy told me that after a few decades, the valves are REALLY tough to move. Telling this story to a fire inspector friend of mine later, he told me this is the reason that the hydrant and fire sprinkler valves in our city are cycled once a year.