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 COMPATIBLE MODELS Earthmoving Compactor 816K 815K Motor Grader 140M 2 12M 3 12M 2 120M 2 160M 2 140M 3 AWD 14M3 140 12M 3 AWD 160M 3 AWD 140M 3 160M 3 Wheel-Type Loader 972M 966M 972K 966M XE 972M XE 966K 972L 966K XE 966L Petroleum Products CX31-P600 CX31-C9I Wheel Dozer 814K Pipelayer PL72 Engine - Industrial C9.3 Track-Type Loader 973 Wheel Tractor-Scraper 637K 627K LRC 627H 627K Track-Type Tractor D6 D6T D6 XE D7E