K&N High-Flow Universal Clamp-On Air Filter RU-1042 — 6" Flange, 6.5" Height, Washable Reusable

The K&N High-Flow Original Lifetime Universal Clamp-On Air Filter (RU-1042) is a washable, reusable round tapered filter engineered to increase airflow and provide long-term filtration for a wide range of engines.

This clamp-on K&N filter uses multiple layers of oiled cotton gauze and a pliable rubber flange to deliver improved airflow while trapping contaminants, and it’s built to be cleaned and reused rather than replaced. With a 6" flange diameter, 6.5" height and 1" flange length, this tapered cone-style filter fits a broad selection of intake setups and universal applications. It’s pre-oiled and ready to install, offering an immediate upgrade for hobbyist projects, off-road builds, motorcycles, ATVs, and custom intake systems.

How does this K&N filter improve engine breathing?

The RU-1042 increases airflow by using a multilayer cotton gauze media that allows more air to pass into the intake while still trapping dirt and particles. Better flow can support stronger throttle response and more efficient combustion when paired with compatible engine tuning and intake components.

• Multi-layer cotton gauze increases air volume through the filter.
• Special tacking agent helps capture fine contaminants without restricting flow.
• Tapered cone design directs air smoothly into the intake tract.
• Pre-oiled media is optimized for immediate use and airflow balance.

How long will this K&N clamp-on filter last and how do I maintain it?

K&N filters are designed for long-term reuse; with normal highway driving the air filter typically needs cleaning every 75,000 miles (about five years based on average yearly mileage). Maintenance is straightforward — remove the filter, wash with K&N cleaner or a mild degreasing solution, rinse, let dry, and reapply K&N filter oil per instructions.

• Clean roughly every 75,000 miles under normal highway conditions.
• Use a compatible cleaner and K&N oil for best performance and longevity.
• Inspect the rubber flange for wear and ensure a secure clamp-fit at each service.
• Reusable design reduces replacement frequency and landfill waste.

Will the RU-1042 fit my setup and how easy is installation?

The RU-1042 is a universal clamp-on filter with a 6" flange diameter and a 1" flange length, intended for many applications that accept a tapered clamp-on intake. Its molded pliable rubber flange absorbs vibration and helps form a snug seal; installation typically requires only a hose clamp and basic hand tools.

• 6" flange diameter and 1" flange length for universal clamp-on applications.
• Pliable rubber flange simplifies attachment and reduces vibration transfer.
• Pre-oiled and ready to mount — usually a single hose clamp is sufficient.
• Available in tapered round shape to suit cone-style intakes and adapters.

What are the construction highlights and warranty?

Built with durable materials and multi-layer filtration media, K&N universal filters prioritize long life and dependable performance. K&N backs the product with a 1-year limited warranty and manufactures these filters in the USA.

• Four layers of premium cotton gauze with a specially designed tacking agent.
• Rugged molded rubber flange resists cracking and improves fitment.
• Pre-oiled for immediate performance and easier initial installation.
• 1-Year limited warranty and made in the USA for quality assurance.

Who is this filter for? The K&N RU-1042 is ideal for DIY mechanics, custom-built intake projects, small-engine installations, motorcycles, ATVs, and anyone seeking a reusable, high-flow clamp-on filter that reduces disposable filter waste. Choose this model when you need a durable, easy-to-install tapered air filter with a 6" flange and washable media that’s built to last the life of the vehicle.