12 sided wrenchWon't damage plastic sensor like other tools willInexpensiveRemoves the water sensor on 2001 and newer 6.6L GM Duramax Diesel EnginesInstalls the water sensor on 2001 and newer 6.6L GM Duramax Diesel EnginesRemoves and installs the Water Sensor on 2001 and newer 6.6L GM Duramax Diesel Engines. Used when replacing the fuel filter or when servicing the water sensor. Plastic sensor has a 12 sided design that is easily damaged by tools, like pliers, that do not specifically fit the sensor.