Description Fleetguard AF27993NF is a NanoForce Magnum RS radial seal primary engine air filter element for heavy-duty truck, mining and construction applications. Designed for SSG radial seal air housings and SP1307 upgrade kits, it cross-references with Caterpillar 2673004 and 4199162, Komatsu XA4292 and XA4292HP, Liebherr 11699071 and Sandvik 1036078.