K&N High-Flow Clamp-On Air Filter RU-2510 — 4" Flange, 3.5" Height, Washable Reusable

The K&N RU-2510 is a washable, reusable clamp-on high-flow air filter designed to boost airflow and provide long-term filtration for a wide range of engines.

This round tapered clamp-on filter from K&N combines multi-layer cotton gauze media with a flexible rubber flange to deliver improved airflow, durable attachment, and maintenance that’s measured in years rather than months. Built for universal use, the RU-2510 fits applications requiring a 4-inch flange diameter and a 3.5-inch filter height, offering a compact, high-performance alternative to disposable paper elements.

How does this filter improve engine breathing?

The RU-2510 uses four layers of premium cotton gauze treated to increase dust-holding capacity while allowing more air through than typical paper filters. Increased airflow can support better throttle response and smoother engine operation without sacrificing protection when maintained properly.

• Multi-layer cotton gauze for higher air volume
• Tacking agent catches fine particles without severely restricting flow
• Pre-oiled media for out-of-the-box filtration readiness

How often will I need to service this K&N filter?

Under normal highway driving, K&N recommends inspection and cleaning far less frequently than disposable filters — typically around every 75,000 miles. Cleaning is simple: remove, wash with the proper cleaning kit, re-oil lightly, and reinstall.

• Clean roughly every 75,000 miles in typical highway use
• Wash and re-oil with K&N-approved products for best results
• Designed to last the life of the vehicle when maintained

Will this clamp-on filter fit my setup and how secure is the mount?

The RU-2510 is a universal clamp-on design intended for applications needing a 4.00-inch flange diameter and a 0.625-inch flange length, with a 3.5-inch overall height and round tapered shape. The molded pliable rubber flange absorbs vibration and seals reliably when clamped to compatible intake pipes or adapter fittings.

• 4.00 in flange diameter and 0.625 in flange length specifications
• Round tapered shape suits tight spaces and cone-style inlets
• Pliable rubber flange reduces vibration and ensures a snug fit

What are the construction highlights and environmental benefits?

K&N builds the RU-2510 with durable materials and proven manufacturing methods, combining longevity with performance. Because the filter is reusable, it cuts down on disposable filter waste and can reduce long-term ownership costs.

• Durable cotton and rubber construction made in the USA
• Reusable design reduces landfill waste from disposable filters
• 1-year limited warranty for added peace of mind

Who is this for: The K&N RU-2510 fits vehicle owners and hobbyists who want an easy-to-install, long-lasting clamp-on filter that increases airflow and reduces recurring filter purchases. It’s suitable for custom intake setups, small engines, performance enthusiasts, and anyone seeking a maintenance-based upgrade rather than frequent disposable replacements.