The Lisle Corporation Compact Wrenches for Davco are designed to remove and install the main filter collar on Davco aftermarket chassis mounted fuel filter assemblies. The compact wrenches have 3/8" square drive and are available in 5", 6", and 8" sizes. The 5" wrench works on any diesel engine with fuel flow rates up to 60 gph, Class 4, 5, and 6 trucks, pickup trucks, refrigeration units, and some biodiesel applications. The 6" wrench works on any diesel engines found in Caterpillar CT660, CT11, CT13, CT15, Cummins, Detroit Diesel, International, Mercedes Benz, Paccar, Daimler Trucks North America, Kenworth, Mack, Navistar, Peterbilt, Thomas Built Buses, and Volvo. The 8" wrench works Detroit Diesel DD13, DD15, and DD16 engines found in Paccar, Daimler Trucks North America, and Volvo.