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

K&N High-Flow Original Universal Clamp-On Air Filter (RU-2800) is a round tapered, washable performance filter with a 5-inch flange and 7-inch height engineered to increase airflow and last the life of your vehicle.

This K&N clamp-on air filter is built for owners who want improved engine breathing without frequent replacements. It combines multiple layers of cotton gauze filtration, a pliable rubber flange for secure attachment, and construction designed to resist vibration and wear. Because the filter is washable and reusable, it’s a practical upgrade for cars, trucks, motorcycles, and other custom or aftermarket intake setups where a universal clamp-on solution is required.

How does this K&N filter improve performance?

The RU-2800 uses a specially treated cotton-gauze media arranged in multiple layers to permit higher airflow while still capturing contaminants. That reduced intake restriction can help throttle response and acceleration in many vehicles when paired with compatible intake systems.

• Four-layer cotton gauze media for increased airflow
• Treated with a tacky agent to trap dust and particles
• Pre-oiled at the factory for immediate installation
• Designed to fit many aftermarket and custom intake setups

Will this filter work with my intake or airbox?

The RU-2800 is a universal clamp-on design meant to adapt to numerous applications using its molded rubber flange and standard clamp attachment. Check flange diameter and available space to confirm fitment before ordering.

• Flange diameter: 5 inches (measured to fit standard clamps)
• Filter overall height: 7 inches — ideal for many cone-style spaces
• Flange length: 1 inch of pliable rubber for vibration absorbing grip
• Round tapered shape suits tapered intakes and many custom setups

How do I maintain and clean this reusable air filter?

K&N filters are engineered to be cleaned and re-oiled instead of replaced. Under typical highway driving you can expect a long service interval between cleanings; regular inspection helps determine if cleaning is needed sooner in dusty conditions.

• Cleaning interval: approximately every 75,000 miles under normal highway driving
• Wash, dry, and re-oil using K&N-approved cleaning kits for best results
• Pre-oiled from the factory — ready to install out of the box
• Reusable design reduces disposable filter waste and recurring expenses

What are the build quality and warranty details?

The RU-2800 is manufactured with robust materials and methods to deliver long-term durability. A one-year limited warranty supports the product, and the item is made in the USA to K&N standards.

• Molded, pliable rubber flange reduces vibrational stress and seals intake
• Durable media and frame construction intended for lifetime use
• 1-Year limited warranty from K&N
• Proudly made in the USA with consistent quality control

Who is this for: The K&N RU-2800 clamp-on filter is suited to vehicle owners, hobbyists, and mechanics who need a universal, high-flow replacement for factory paper filters or custom intakes. It’s a smart choice if you want an easy-to-install, washable filter that boosts airflow, reduces recurring filter purchases, and fits a wide range of aftermarket setups. If you have limited space around the intake or require a specific flange diameter, verify measurements to ensure compatibility before purchase.