Description Fleetguard WF2077 is a non-chemical spin-on coolant water filter for heavy-duty diesel engines, providing particulate filtration for engine cooling systems using OAT, hybrid or conventional coolants. It has 11/16-16 UN-2B thread, approximately 137.31 mm overall height and 93.73 mm outer diameter, and is commonly used on Cummins Signature, Caterpillar, Detroit Diesel, Freightliner and International applications.