K&N Universal Clamp-On Air Filter RF-1015 — 4 in Flange, 7 in Height, Washable High-Flow

The K&N High-Flow Original Lifetime Universal Clamp-On Air Filter (RF-1015) is a washable, reusable cone-style filter engineered to increase airflow and last for the life of your vehicle.

Designed as a universal clamp-on solution, this K&N air filter fits a wide range of applications thanks to its 4-inch flange diameter, 7-inch height and 0.625-inch flange length. Built with multiple layers of premium cotton gauze media and a pliable molded rubber flange, the RF-1015 aims to boost engine breathing while offering durable construction and long service intervals compared with disposable filters.

How does this filter improve engine performance?

The multi-layer cotton gauze media increases airflow to the intake, which can help throttle response and overall engine efficiency when installed correctly. K&N’s specially treated layers balance filtration and flow to trap contaminants while allowing greater volume of air than many stock paper filters.

• Four-layer cotton gauze for increased flow with contaminant capture
• Pre-oiled media for immediate protection out of the box
• Tapered cone shape promotes smoother intake air entry
• May enhance horsepower and acceleration in compatible setups

How durable and maintenance-friendly is the RF-1015?

This K&N filter is made from rugged materials built to withstand vibration and repeated service; the molded rubber flange absorbs movement and secures the clamp-on fit. Unlike disposable filters, it is washable and reusable—cleaning intervals are long under normal highway driving conditions.

• Constructed with strong molded rubber flange to resist cracking
• Clean only every 75,000 miles under typical highway use (approx. 5 years)
• Reusable design reduces landfill waste and recurring purchases
• Backed by a 1-year limited warranty and made in the USA

Will it fit my vehicle or custom intake setup?

The RF-1015 is a universal clamp-on filter made to suit many aftermarket and OEM intakes that accept a 4-inch flange. Because it’s a tapered, cone-style filter, its shape adapts well to tight engine bays and custom plumbing where a clamp-on solution is required.

• 4-inch flange diameter commonly accepted by many intake tubes
• 0.625-inch flange length provides a secure clamping surface
• Round tapered profile fits a variety of orientations and spaces
• Available across many K&N part numbers for broader compatibility

How do I install and care for this clamp-on air filter?

Installation is straightforward: slide the filter onto the intake tube and secure with a clamp; the pre-oiled media is ready to use immediately. When cleaning is needed, K&N supplies a cleaning and re-oiling process to restore filtration efficiency—no special tools required for routine service.

• Pre-oiled at the factory for instant installation
• Slide-on mounting with standard clamp (clamp not included in some kits)
• Use K&N cleaning kit for best results and media longevity
• Inspect periodically for debris and reapply oil after cleaning

Who is this for: The K&N RF-1015 is a good match for enthusiasts, mechanics and DIYers who want a long-lasting, reusable clamp-on air filter that fits 4" flanged intakes. It suits people upgrading factory filters for better airflow, those building custom intakes, and anyone seeking a reduction in disposable filter purchases while retaining reliable filtration and robust construction.