Join the millions of customers who have saved money and improved vehicle performance by upgrading to K&N filtration. K&N Universal Clamp-On Air Filter: High Performance, Premium, Replacement Engine Filter: Flange Diameter: 1.125 In, Filter Height: 2.5 In, Flange Length: 0.625 In, Shape: Round Tapered, RC-2540 - Walmart Supplies Unlike disposable paper filters which must be frequently replaced, K&N Air Filters are washable, reusable, and engineered to last for the life of your vehicle. ECO-FRIENDLY: Using a washable, reusable product helps reduce replacement waste. WORLD CLASS PROTECTION: Pushing the limits of engine protection by protecting your engine from harmful contaminants. A K&N filter will last longer than 10 disposable filters. K&N Universal Clamp-on Air Filters are manufactured for a wide variety of applications and unique filtration needs. SAVES MONEY: K&N high-flow replacement air filters will save you $250 over 10 years by avoiding disposable filters. ENGINEERED POWER: State-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration. K&N RC-2540 Round Tapered Universal Clamp-On Air Filter ; Frame Design. Flexible ; Height. 2.5 in (64 mm) ; Inlet Flange Inside Diameter. 1.125 in (28.575 mm Flange Inside Diameter, 1.125 in (29 mm) ; Air Filter Shape, Round Tapered ; Top Material, Chrome ; Top Style, Metal ; Top Outside Diameter, 2 in (51 mm LOW-MAINTENANCE DESIGN: 50,000 miles before your first cleaning under normal highway driving conditions. K&N RC-2540 Universal Clamp-On Air filter 1.125 Flange One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains. RACE TESTED: The Official Air Filter of NASCAR.