Lisle's Aftermarket Water Sensor Wrench, No. 34910, removes and installs the aftermarket water sensor located on the fuel filter on 2001 through 2011 6.6L Duramax Diesel engines. It can be used when replacing the fuel filter or when servicing the water sensor. The aftermarket plastic sensor has a modified octagon shape that is easily damaged by tools, like pliers, that do not specifically fit the sensor. Made in the USA.