Will it fit my equipment? Standard Efficiency Engine Air Filters are your best value for normal duty applications providing larger capacity and quick servicing. You can't control the environment you're working in, but you can keep your engine working longer by keeping the air inside clean. Cat Engine Air Filters are designed to meet strict standards and provide the best protection for your Cat engine."You can't control the environment you're working in, but you can keep your engine working longer by keeping the air inside clean. Cat Engine Air Filters are designed to meet strict standards and provide the best protection for your Cat engine."You can't control the environment you're working in, but you can keep your engine working longer by keeping the air inside clean. Cat Engine Air Filters are designed to meet strict standards and provide the best protection for your Cat engine. Specifications Primary vs Secondary: Secondary Efficiency Rating: Standard Efficiency Seal Type: Axial Seal Compatible Models WHEEL TRACTOR-SCRAPER 651E,637D,637E,657E ENGINE GENERATOR SET 3412C,3412,G3406,3408C,3408,3408B ROAD RECLAIMER SS-250,SM-350,RR-250,RM-350 ENGINE MACHINE 3408,3412 WHEEL-TYPE LOADER 992C,988B,992D ENGINE INDUSTRIAL 3412C,3412,G3406,3408C,3408,3408B OFF-HIGHWAY TRUCK 769C,772B,773B,768C,775B