K&N High-Flow Universal Clamp-On Air Filter RU-3020 — 5" Flange, 9" Height, Washable Reusable

The K&N High-Flow Original Lifetime Universal Clamp-On Air Filter (RU-3020) is a washable, reusable round clamp-on filter with a 5-inch flange and 9-inch height engineered to increase airflow and last the life of your vehicle.

This clamp-on air filter from K&N is built for a wide range of equipment and custom installations where a universal, high-flow, durable filter is needed. Featuring a pliable molded rubber flange, multi-layer cotton gauze media, and a washable design, the RU-3020 is made to replace disposable filters and provide consistent breathing for engines, motors, or aftermarket intake setups. It ships pre-oiled and ready to install, making it an easy performance-focused upgrade for projects that require a round clamp-on filter with a 5-inch inlet.

How does this filter improve airflow without frequent replacements?

The RU-3020 uses multiple layers of premium cotton gauze treated with a tackifier to trap contaminants while allowing increased air volume compared with many paper elements. Because the media is washable and reusable, it avoids the recurring expense and waste of disposable filters.

• Four-layer cotton gauze filtration for balanced airflow and particulate capture
• Pre-oiled media to start protecting immediately after installation
• Maintenance interval up to 75,000 miles under normal highway driving before cleaning

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

The RU-3020 is a universal clamp-on design made to attach to a wide variety of intake tubes and aftermarket setups. Its 5-inch (flange diameter) opening and 1-inch flange length match many common applications, and the pliable rubber flange helps compensate for slight misalignment.

• 5-inch flange diameter fits many intake tubes and adapters
• Pliable molded rubber flange absorbs vibration and seals reliably
• Pre-oiled and drop-in ready for fast installation with a clamp

How durable is the construction and what maintenance does it need?

K&N builds this filter with rugged materials designed for long service life: a durable rubber base, reinforced mesh, and wash-and-reuse cotton media. Routine care is straightforward — clean and re-oil when needed rather than replace, reducing waste and long-term cost.

• Heavy-duty molded rubber flange resists cracking and vibration
• Washable cotton gauze can be serviced using K&N cleaning kits
• Designed for long life with a 1-year limited warranty and USA manufacturing

What specific dimensions and specs should I confirm before buying?

Confirm the filter’s 5-inch flange diameter and 9-inch overall height against your intake space to ensure a correct fit. The 1-inch flange length and round shape are important for clamp compatibility and clearance inside your installation area.

• Flange diameter: 5 inches (fits common intake tubing)
• Filter height: 9 inches overall for clearance planning
• Flange length: 1 inch; round shape (RU-3020) for symmetric mounting

Who this is for: The K&N RU-3020 suits DIY mechanics, custom intake builders, powersports enthusiasts, and anyone who needs a reliable clamp-on round air filter that improves airflow, reduces recurring filter purchases, and simplifies maintenance. It’s particularly useful when a 5-inch inlet is required and a reusable solution is preferred over disposable paper elements. If you want a durable, washable filter with established filtration media and an easy clamp-on installation, this K&N universal filter is engineered to meet those needs without frequent replacements.