K&N Releases a New Three Inch Diameter Round Universal Air Filter

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K&N manufactures a wide variety of universal air filters for many applications. No matter the angle or offset diameter of the air intake, there is a K&N universal air filter that will meet your specific needs.

K&N universal air filter RU-2310
K&N universal air filter RU-2310
The RU-2310 is K&N’s newest addition to its ever growing list of universal air filters. K&N universal rubber air filters feature a pliable flange that can stretch up to 1/16” (1.5mm) to fit sizes in-between the filter's actual flange diameter.

The RU-2310 features a flange length of .625 inches (16mm), allowing plenty of room to clamp onto a variety of engine intake tubes. This universal air filter has a small flange inside diameter of 1.563 inches (40mm) as well as a total length of 4.563 inches (116 mm).

This universal air filter is washable and reusable. It is ideal for small industrial engines with a 40 mm round intake. Given its durability it will probably last longer than your equipment.

Every K&N filter has 40 years of research and development standing behind it, making K&N the leader in air filtration technology.

To find universal air filters for your specific needs go to our K&N Universal Air Filter Search by Dimension on  To find K&N products for your vehicle use the K&N Application Search.  To find a K&N dealer near you use our K&N Dealer Search.

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K&N Engineering, Inc., with headquarters in Riverside, California, has been the world's leader in performance filter technology since 1969, serving the needs of the automotive, motorcycle, marine, industrial and military markets. K&N is heavily involved in nearly every form of motorsports from off-road and powersports to drag racing, stock cars and road racing. For more information about K&N Filters, please contact K&N Engineering, Inc., P.O. Box 1329, Riverside, CA 92502-1329, (800) 213-4182 for a dealer near you, (800) 858-3333 for technical service/questions, (951) 826-4001 Fax, e-mail, or visit