Description Fleetguard AF879M is a primary axial seal engine air filter element for heavy-duty off-highway and truck applications. It uses a cylindrical pleated filter media with axial sealing and includes bolt seal 3830497 to ensure a secure, leak-free fit in the air cleaner housing. Nominal dimensions are approximately 599.95 mm overall height, 472.44 mm largest outside diameter, 446.99 mm secondary outside diameter, 281.81 mm inner diameter at the outlet and 22.86 mm mounting bolt hole. This element is used in applications where Donaldson P115069 or XLP182038 primary air filters are specified and serves as an upgrade to the earlier AF879 design. Cross-reference part numbers include Donaldson P115069 and P182038, Baldwin LL2363, Mann C 45 005 x, and Wix 42440.