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

K&N RU-2800 is a washable, reusable high-flow universal clamp-on air filter designed to increase airflow and deliver lasting filtration for a wide range of engines.

Built for hobbyists, mechanics, and performance-minded drivers, this tapered cone-style clamp-on filter pairs K&N’s multilayer cotton gauze media with a pliable rubber flange so it fits many aftermarket intakes and custom setups. The RU-2800 has a 5-inch flange diameter, 1-inch flange length and 7-inch overall height, offering a compact yet efficient solution when a durable, long-life air filter is needed for speciality applications.

How does this filter improve engine breathing and performance?

The RU-2800 uses stacked cotton gauze layers treated with a tackifying agent to capture contaminants while allowing increased airflow compared with typical disposable paper elements. Improved airflow can support better throttle response and a more efficient induction charge without sacrificing particle protection.

• Multi-layer cotton gauze media for both flow and filtration
• Pre-oiled at the factory for immediate use
• Engineered to increase horsepower potential and acceleration response

Will this clamp-on filter fit my application and how easy is installation?

The universal clamp-on design fits many aftermarket air intakes, ducting and custom projects where a 5-inch flange is compatible. A flexible, molded rubber flange absorbs vibration and seals securely, making installation fast with a simple clamp or hose connection.

• 5-inch flange diameter and 1-inch flange length for common coupler sizes
• Tapered round shape (cone-style) to suit compact spaces
• Works with standard hose clamps and intake collars for quick mounting

How durable and maintainable is the K&N RU-2800?

Constructed from robust materials and manufactured to K&N standards, this filter is designed to be serviceable rather than disposable. With routine cleaning and re-oiling per K&N guidelines it can provide years of use, reducing the need for frequent replacements and lowering waste.

• Durable molded rubber flange to resist tearing and vibration
• Recommended cleaning interval around 75,000 miles under normal highway driving
• Washable, reusable media reduces landfill waste and long-term cost

What should I expect in terms of warranty, origin, and support?

K&N backs its air filters with a one-year limited warranty and manufactures the RU-2800 in the USA. Technical resources and replacement parts are available through K&N’s support channels if you need guidance on fitment or maintenance.

• 1-year limited warranty included
• Proudly made in the USA for consistent quality
• Extensive online resources for cleaning kits and step-by-step care

Who is this for: The K&N RU-2800 is ideal for do-it-yourself installers, engine tuners, and custom-build enthusiasts who need a compact, high-flow clamp-on filter with a 5-inch inlet. It suits projects that demand a reusable, long-lasting inlet filter—such as cold-air intakes, short ram setups, small engines, and vintage vehicles—where a tapered cone and flexible flange simplify fitment and maintenance.