Description Fleetguard WF2123 is a non-chemical, extended-service spin-on water/coolant filter for heavy-duty diesel engine cooling systems, designed to provide particulate filtration only for OAT, hybrid, and conventional coolants. It features an overall height of approximately 138 mm (5.43 in), a largest outer diameter of about 93.7 mm (3.69 in), and an 11/16-16 UN-2B thread, with gasket dimensions matched to common heavy-duty coolant filter heads. This filter cross-references Cummins 3098690 and XWF4245, MTU 2043697, Baldwin B5090, WIX 24084 and related equivalents, and is widely used on Freightliner, International, Ford, Peterbilt, Kenworth, Mack, Blue Bird, and Western Star trucks equipped with Cummins engines.