Compatible with all four OEM and aftermarket sensor hex sizes currently available, the Snap-on Fuel Filter Water Sensor Wrench, No. WSW3, eliminates the need for multiple wrenches. The innovative WSW3 is a durable all-in-one, glass-filled nylon tool for 40mm, 41mm, 42mm and 46mm sizes. Lightweight and cost effective, the WSW3 will not damage the sensor like competitive steel wrenches, according to the company. Compatible with 6.6L Duramax diesel engines, the WSW3 works on 2001 to current model Chevrolet Silverado and GMC Sierra 2500 and 3500 vehicles.