Disconnects Air Conditioning and Quick Connect Fuel Lines. Connect Fuel Lines.Removes and Installs the Water Sensor Located on the Fuel Filter on 2012 – 2016 6.6L Duramax Diesel Engines. The 42mm wrench also works on 2013 and newer 6.7L Cummins. For use when replacing the fuel filter or when servicing the water sensor. The plastic sensor has a new hex design that is easily damaged by tools, like pliers, that do not specifically fit the sensor. Disconnects spring lock couplings on Ford and Chrysler AC lines. Works on fuel lines and other quick disconnect couplings on domestic and import vehicles. The handles are angled to access tight spots. Made of durable plastic that resists fuels and solvents. Six sizes: 5/16", 3/8", 1/2", 5/8", 3/4" and 7/8". All disconnects available individually skin-packed.