The ARES 4-in-1 Water in Fuel Filter Sensor Wrench, No. 14023, is designed to remove and replace water in fuel filter sensors of all current OE and aftermarket sensor sizes. Includes wrench sizes in 40mm (12pt), 41mm (12pt), and 46mm (8pt notched). Features a glass-filled nylon injection design and precise fitment that is intended to provide maximum durability and protect sensors during maintenance, ARES says. This wrench works on 6.6L Duramax and 6.7L Cummins diesel engines. Additionally, the 40mm and 41mm end can be used for 2001 to 2011 Chevy Silverado and 2500/3500 GMC Sierra vehicles.