K&N High-Flow Universal Clamp-On Air Filter RD-0720 — 2.5" Flange, 6" Height, Washable Performance

K&N High-Flow Original Lifetime Universal Clamp-On Air Filter (RD-0720) is a washable, reusable clamp-on intake filter that increases airflow while offering long-lasting filtration for many applications.

This clamp-on performance filter is built to deliver improved airflow and durability without the recurring expense of disposable air filters. Constructed with multi-layer cotton gauze media, a molded rubber flange, and robust construction, the RD-0720 suits a wide range of engines and custom intake setups. It’s pre-oiled and ready to install, making it a quick upgrade for enthusiasts and technicians who want a reliable balance of protection and airflow.

How does this filter affect engine breathing and performance?

The K&N High-Flow media is engineered to allow more air into the engine compared with typical paper filters, which can help throttle response and maintain power at higher flow rates. It focuses on balancing airflow with filtration so the engine receives cleaner air without choking performance.

• Multi-layer cotton gauze increases flow while trapping particles.
• Pre-oiled media optimizes immediate filtration after installation.
• Engineered to support horsepower and acceleration improvements.

What are the key dimensions and installation details I should know?

The RD-0720 has a 2.5 inch flange diameter, a 0.625 inch flange length, and a 6 inch overall height in a round shape—ideal for clamp-on intake tubes or custom setups. The pliable rubber flange absorbs vibration and creates a secure seal around the intake tube when clamped.

• Flange diameter: 2.5 in; flange length: 0.625 in; filter height: 6 in.
• Round profile fits many clamp-on applications and adapter rings.
• Installation: slide onto intake tube and secure with hose clamp (not included).

How do I maintain this filter and how long will it last?

K&N filters are washable and reusable, meaning you clean and re-oil them instead of replacing them each service interval. Under normal highway driving, cleaning is typically required about every 75,000 miles, so the unit is designed to last for the life of the vehicle with periodic maintenance.

• Recommended cleaning interval: about every 75,000 miles under normal highway conditions.
• Reusable design cuts disposable filter waste and lowers long-term costs.
• Made in the USA with a 1-year limited warranty for peace of mind.

Is this filter compatible with my vehicle or custom intake system?

The RD-0720 is a universal clamp-on filter intended to work with many intake tubes and custom applications rather than a vehicle-specific replacement panel. Its round shape and 2.5 inch flange make it suitable for many motorsports, motorcycle, powersports, and DIY intake projects.

• Universal clamp-on design fits a wide range of tubes and adapters.
• Available in multiple shapes and sizes across K&N’s clamp-on family for different needs.
• Best for custom intakes, aftermarket induction systems, and non- OE housings.

Who is this for: The K&N RD-0720 clamp-on filter is aimed at enthusiasts, mechanics, and DIY builders who want a durable, reusable intake filter that prioritizes airflow and long-term value. It’s a sensible upgrade for anyone installing or modifying intake systems on cars, trucks, motorcycles, ATVs, or custom engines where a 2.5 inch clamp-on flange and 6 inch height are appropriate.