FILTERWEARS Pre-Filter K259R For K&N Air Filter RC-4780 FORD SUPER DUTY, EXCURSION, F-350, F-250; V8-7.3L DSL Reduces overall maintenance cost, Extends filter service intervals, Add convenience, Extend the life of any filter exposed or not Keep your high performance filter free of debris/dirt and water, Effective barrier for any particle bigger than .005 inches No reduction of functionality in freezing temperatures, Hydrophobic fabric is standard (water repellent), Handle heat up to 450 degrees Fahrenheits Made from 100% monofilament polyester, with straps at the base of pre-filter for ease of installation Size: 5.25"TD, 6.63"BD, 9.5"H