The "Inverted design of this unique OE replacement filter fully utilized the space in the stock air box to provide the most filter media of any "drop-in OE replacement filter. With seven layers of progressively finer mesh cotton gauze/synthetic media, this high flow "oiled" OE replacement performance filter provide maximum protection with highest cumulative filtration efficiency for severe duty environments. Washable and reusable for multiple cleanings, the tall open evenly spaced pleats provide excellent dust holding capacity for longer service cycle between cleanings. Integrated urethane bump seal insures tight, no leak seal over the life of the filter.