K&N Universal Round Air Filter 52mm offset flange (29mm), 149mm, 51mm height (RU-045V) K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications. Regardless of the angle or offset diameter of the air intake, there is probably a K&N Universal air filter for your equipment. All filters are constructed with ultra-strong molded pliable rubber flanges which absorb vibration and allow for secure attachment and can also be stretched for up to 1/16'' (1.5mm) to fit in-between sizes. K&N universal air filters are washable and reusable. - Designed to increase horsepower and acceleration - Hundreds of sizes and shapes for most applications - High air flow with excellent filtration - Clamp-on washable and reusable air filter - Malleable flanges - One year limited warranty