K&N High-Flow Universal Clamp-On Air Filter RU-2510 — 4" Flange, Washable High-Flow Cotton

The K&N High-Flow Original Universal Clamp-On Air Filter (RU-2510) is a washable, reusable clamp-on filter designed to boost airflow and long-term engine performance while fitting a wide range of intake applications.

This tapered, round clamp-on filter from K&N pairs a 4-inch flange with a 3.5-inch height and a 0.625-inch flange length to deliver a compact, high-capacity filtration solution for many aftermarket and custom intake setups. Built with multiple layers of oiled cotton gauze, a pliable molded rubber flange, and durable construction, the RU-2510 is intended to replace disposable paper elements and provide years of service with periodic cleaning.

How does this clamp-on filter improve vehicle airflow and performance?

The RU-2510 uses stacked layers of premium cotton media treated to attract and retain particles while allowing increased air volume into the intake. Greater unrestricted airflow can support improved throttle response and consistent engine breathing across RPM ranges without sacrificing filtration efficiency.

• Multi-layer cotton gauze media for high flow and protection
• Pre-oiled filter surface for immediate performance out of the box
• Round tapered shape promotes smooth air entry into cones or ducts

Will this filter fit my setup and how is it installed?

Designed as a universal clamp-on unit, the RU-2510 fits any intake with a compatible flange diameter and clamp. The soft, molded rubber flange absorbs vibration and creates a secure seal — installation is typically a matter of sliding the flange over the intake neck and tightening a hose clamp.

• 4-inch flange diameter fits matching intake necks or adapters
• 0.625-inch flange length for flexible clamp engagement
• Works with a variety of round, tapered, or cone-style intake housings

How long does one of these filters last and what maintenance is required?

K&N Universal filters are built for extended service life — they are washable and reusable rather than disposable. Under typical highway use, cleaning intervals can be measured in tens of thousands of miles; when cleaning is required, the element is serviced with K&N cleaning kit or an equivalent process and then re-oiled according to instructions.

• Washable and reusable design reduces replacement frequency
• Suggested cleaning interval around 75,000 miles under normal highway driving
• Made in the USA with a 1-year limited warranty for added assurance

Is this filter durable and safe for regular use?

The RU-2510 is constructed with rugged materials to withstand under-hood and aftermarket conditions. The pliable rubber flange cushions vibration, while the multi-layer media and robust assembly resist tearing or deformation during service and cleaning.

• Durable molded rubber flange for secure attachment and vibration absorption
• Four protective media layers for particle capture and longevity
• Pre-oiled and ready to install; withstands repeated cleanings

Who is this product for? The K&N RU-2510 clamp-on air filter is aimed at vehicle owners, mechanics, and hobbyists who want a compact, reusable performance filter for custom intakes, replacement on non-standard airboxes, or upgrades to improve airflow without frequent filter replacements. It suits DIY installers, track enthusiasts seeking consistent airflow, and anyone looking to reduce disposable filter waste while maintaining reliable filtration. If your intake has a 4-inch neck and you need a tapered, cone-style clamp-on element that’s built to last, the RU-2510 is a practical choice.