K&N RU-4550 Universal Clamp-On Air Filter 4" Flange, Washable Reusable

Vehicle Fitment

• Universal fit - fits any intake with approx. 4.0 in (102 mm) inside-diameter flange

Features

• Universal clamp-on design supports a wide variety of vehicles and custom intake systems
• High-flow cotton gauze media engineered for improved horsepower and acceleration
• Washable and reusable filter for long-term value and reduced replacement cost
• Molded pliable rubber flange absorbs vibration and allows slight size variation (~1/16 in / 1.5 mm)
• Four-layer cotton gauze filter media for robust contaminant protection
• Easy installation - simply clamp over the correct flange and secure
• Reduces waste compared to disposable filters thanks to its reusable design
• Backed by manufacturer's 1-Year Limited Warranty

Specifications

• Flange inside diameter: 4.0 in (102 mm)
• Filter height: approx. 6.0 in (152 mm)
• Top outside diameter: approx. 4.5 in (114 mm)
• Large end outside diameter (base): 5.375 in (137 mm)
• Flange length: 0.625 in (16 mm)
• Filter media: Premium multi-layer cotton gauze
• Washable/reusable: Yes
• Weight: approx. 1.3 lb (0.6 kg)
• Warranty: 1-Year Limited

Included Components

• 1x Universal clamp-on air filter (Part No. RU-4550)
• Installation instructions/documentation

Product Description

The K&N RU-4550 Universal Clamp-On Air Filter is a versatile upgrade built for custom intake systems, performance vehicles, and non-stock applications. With an inside-diameter flange of approximately 4.0 in (102 mm), this filter is engineered to fit a wide variety of setups. Featuring high-flow, washable cotton gauze media and a molded rubber flange designed to absorb vibration and allow slight sizing tolerance, it delivers both performance and durability.

Installation is straightforward: confirm your intake flange is approximately 4.0 in (102 mm) inside diameter, slide the RU-4550 filter onto the flange, clamp securely, and you're ready. The washable and reusable design offers long-term value and reduced waste compared to disposable filters. As this is a universal-fit product (not tied to a specific make, model, or engine), always verify clearance and correct fitment in your intake system before purchase.