Features and Benefits * 12 sided wrench * Wont damage plastic sensor like other tools will * Inexpensive * Removes the water sensor on 2001 and newer 6.6L GM Duramax Diesel Engines * Installs the water sensor on 2001 and newer 6.6L GM Duramax Diesel Engines Removes 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.