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

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

This clamp-on filter from K&N combines multi-layer cotton gauze media and a pliable molded rubber flange to deliver higher airflow without frequent replacement. Built for a wide range of applications, the RU-3020 fits many custom and aftermarket installations where a round, clamp-on connection is required. It arrives pre-oiled and ready to use, and K&N’s washable design reduces long-term cost and waste compared with disposable paper filters.

How does this filter affect engine performance?

The K&N high-flow media is engineered to let more air pass into the intake while still trapping contaminants. Increased airflow can support better throttle response and consistent power delivery under normal conditions.

• State-of-the-art multi-layer cotton gauze media for improved breathing
• Pre-oiled filter media ready to install for immediate use
• Designed to increase horsepower and acceleration potential
• Durable construction to maintain performance over time

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

This RU-3020 model is a round clamp-on style with a 5-inch flange diameter, a 1-inch flange length, and a total height of 9 inches—suitable for many universal intake setups. The pliable rubber flange helps absorb vibration and creates a secure connection to clamps or piping.

• Flange diameter: 5 inches (fits standard 5" clamp connections)
• Flange length: 1 inch for secure sealing
• Filter height: 9 inches for increased filter area
• Round shape, model RU-3020, universal clamp-on design

How do I maintain and clean the filter?

K&N filters are washable and intended for long-term reuse; under typical highway driving they only need cleaning approximately every 75,000 miles (about once every five years for average use). Cleaning uses K&N’s recommended filter cleaner and re-oiling process to restore filtration and performance.

• Wash with K&N cleaner, rinse, let air dry completely
• Re-oil evenly using K&N filter oil to restore trapping efficiency
• Typical service interval: up to 75,000 miles under normal highway driving
• Reusable design reduces disposable filter waste

Is the RU-3020 durable and backed by warranty?

The RU-3020 is manufactured with rugged materials and modern construction to provide long-lasting use; it’s also proudly made in the USA. K&N includes a 1-year limited warranty to cover manufacturing defects.

• Durable molded rubber flange resists vibration and tearing
• Multi-layer cotton gauze treated with adhesive for longevity
• Made in USA with performance-focused quality control
• 1-year limited warranty for peace of mind

Who this is for: The K&N RU-3020 fits vehicle owners, custom builders, tuners, and hobbyists who need a universal round clamp-on filter with a 5-inch flange and 9-inch height. It’s ideal for projects where a reusable, high-flow intake solution is preferred over disposable filters—especially when long-term cost savings, reduced waste, and straightforward maintenance are priorities.