Standard Efficiency Engine Air Filter - Secondary Cat Secondary Engine Air Filters are your last line of defense against dust, dirt and other contaminants that may damage the components of your income-producing machinery. Tasked with protecting the engine while the primary filter is being changed or in the event of a breach in the main filter, this secondary unit plays a critical role in preventing damage due to contaminants. Constructed of durable materials and manufactured to meet Caterpillar’s stringent specifications, these air filters deliver the consistent quality and reliability that Cat owners count on. Because uptime and cost-effective maintenance are critical, Cat Air Filters have been specifically designed to protect and optimize the power of your Cat iron. Working together, genuine Cat Primary and Secondary Filter Elements provide a cost-effective method for maintaining your engine’s integrity and increasing your equipment’s uptime on the jobsite. Attributes: Environmentally friendly Increased airflow with less restriction Serves the critical role of back-up filtration SPECIFICATIONS Efficiency Rating: Standard Efficiency Primary vs Secondary: Secondary Seal Type: Axial Seal COMPATIBLE MODELS Cold Planer PM310 PM313 PM312 Forest Products 586C 345C 2864C TK1051 521 522 Wheeled Excavator W345C MH Engine - Generator Set 3406C C9 Petroleum Products C9 Underground Articulated Truck AD60 Excavator 345C L 349D2 L 349E L VG 345B II 349F LXE 349F L 349D L 352F XE VG 345D L VG 349E L 345C 345D 345D L 352F 349D2 349E 352F OEM 345C MH 349D 352F-VG 352FMHPU 349F 349E L HVG 345B 345B L Articulated Dump Truck 735 OEM 730C2 730C 740 GC 735B 740B 745 735C 730C2 EJ 740 745C 740C 735 730