K&N High-Flow Universal Clamp-On Air Filter RU-2800 — 5" Flange, 7" Height, Washable High-Flow Performance

The K&N RU-2800 is a washable, high-flow universal clamp-on air filter that increases airflow while providing long-lasting contamination protection.

This tapered (cone-style) K&N clamp-on filter is built for a variety of applications that need a reliable boost in airflow without frequent replacements. With a 5-inch flange diameter, 1-inch flange length and a 7-inch filter height, the RU-2800 combines multi-layer cotton media with a pliable rubber flange for secure mounting, vibration absorption and extended service life.

How does this filter improve engine performance?

The RU-2800 uses multiple layers of premium cotton gauze treated with a tack agent to create a dense yet breathable filtration surface. That design allows increased airflow compared with many disposable filters while still trapping dust and debris to protect internal components.

• Multi-layer cotton gauze media increases airflow and throttle response.
• Engineered to support horsepower and acceleration improvements.
• Pre-oiled for immediate use and optimized filtration balance.

What makes this filter reusable and low-maintenance?

Unlike one-time-use paper elements, the K&N RU-2800 is washable and serviceable, designed to last for the life of most vehicles when maintained properly. Under normal highway driving, cleaning intervals can be as infrequent as every 75,000 miles (about five years for average annual mileage), reducing cost and waste over time.

• Washable cotton media can be cleaned and re-oiled instead of replaced.
• Durable materials and construction intended for long service life.
• Lower long-term ownership cost compared with disposable filters.

Will it fit my setup and how is it installed?

The RU-2800 is a universal clamp-on design intended to work across many intake configurations that accept a 5-inch flange. Its flexible molded rubber flange makes installation straightforward and helps dampen vibration for a secure seal. Clamp-on fitment makes it an easy upgrade for cold-air intakes, replacement filter housings or custom builds.

• 5-inch flange diameter with 1-inch flange length for standard clamp mounting.
• Pliable rubber flange eases attachment and reduces vibration transfer.
• Compatible with round tapered intake openings and many aftermarket intakes.

What are the construction and warranty details?

Built with K&N’s layered cotton gauze and robust molded rubber, the RU-2800 is manufactured for durability and consistent filtration performance. The product is made in the USA and comes with a 1-year limited warranty to cover defects in materials and workmanship.

• Four-layer cotton gauze filtration treated for improved contaminant capture.
• Rugged molded rubber flange and quality construction for long life.
• Made in the USA; backed by a 1-year limited warranty.

Who this is for: The K&N RU-2800 is ideal for drivers, mechanics and builders who want a reliable, reusable clamp-on air filter that boosts airflow and cuts recurring filter costs. It's well suited to performance-minded enthusiasts, custom intake projects and anyone replacing disposable filters with a more sustainable option.