Emergency Gas and Water Shut-Off Wrenches are a must-have for any plumber or homeowner. Gas leaks, plumbing leaks and natural disasters occur with little or no warning, be prepared to turn off your gas or water supply at the source. Multiple-sized slots are designed to fit most gas valves. Quickly address water emergencies by inserting the gas shut-off wrench onto the end of water wrench, creating a T-handle.