K&N Clamp-On Air Filter Dryflow — 6in Flange, 7.5in Height, Washable Reusable High-Flow

The K&N Dryflow RU-3101HBK is a reusable clamp-on tapered air filter that boosts airflow while offering washable, long-lasting filtration for a wide range of engines.

This clamp-on filter from K&N combines a conical, tapered design with dual-layer dry synthetic media and a pliable molded rubber flange to deliver reliable air intake performance without disposable replacements. Built for universal fitment and engineered for repeated cleaning, it’s intended as a durable alternative to paper elements for many custom and replacement airbox or intake setups.

How does this clamp-on filter improve intake airflow?

The Dryflow media is engineered to allow more air to move into the engine compared with many stock paper filters, while still providing particle capture through two layers of synthetic filtration. Increased airflow can help engines breathe more freely under load and during acceleration.

• Dual-layer dry synthetic media balances airflow and contaminant trapping
• Tapered cone shape encourages smooth air entry to the intake
• Designed for higher-flow applications than many disposable elements

What are the physical dimensions and mounting details?

This model has a 6-inch flange diameter, a 7.5-inch overall height, and a 1-inch flange length, making it suitable for many clamp-on installations. The molded rubber flange flexes to absorb vibration and to seal well around intake tubes or adapter collars.

• Flange diameter: 6 inches for common intake tubes and adapters
• Filter height: 7.5 inches for compact and mid-sized installations
• Flange length: 1 inch provides a robust surface for secure clamps

How do I maintain and clean this washable filter?

Unlike disposable paper filters, the Dryflow element is designed for periodic cleaning and reuse. Under typical highway driving conditions, K&N recommends inspecting and cleaning approximately every 50,000 miles, but frequency depends on your environment and driving habits.

• Wash with a suitable cleaner, rinse, dry, and reinstall—no oils required
• Inspect regularly in dusty or off-road conditions and clean sooner if needed
• Engineered to remain functional over many cleaning cycles for long-term use

Is this filter easy to install and where will it fit?

The clamp-on design makes installation straightforward: slide the rubber flange onto the intake tube or adapter and fasten with a hose clamp. Its universal tapered shape is offered to fit many custom applications, cold air kits, or replacement setups where a clamp-on element is preferred.

• Ready for drop-in or clamp-on applications with standard hose clamps
• Works well with many aftermarket intake tubes and custom adapters
• Durable construction minimizes the need for frequent replacements

Who is this for: drivers, hobbyists, and mechanics looking for a durable, reusable clamp-on filter for custom or replacement intake setups. It suits those who want a washable, long-lived alternative to disposable paper filters and need a tapered, 6-inch flange element for a variety of engines and uses. Ideal for people who value reduced maintenance waste, easy installation, and consistent airflow characteristics across many driving conditions.