K&N RU-3700 Universal Clamp-On Air Filter 3" Flange, Washable Reusable

Vehicle Fitment

• Universal fit - fits any intake with approx. 3.0" (76 mm) inside-diameter flange

Features

• Clamp-on universal design accommodates a wide variety of vehicles and custom applications
• High-flow cotton gauze media engineered to increase 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 (up to ~1/16"/1.5 mm)
• Four-layer cotton gauze filter media for effective contaminant trapping
• Easy installation - simply clamp over the intake flange and secure
• Reduces waste of disposable filters by offering a lifelong reusable option
• Backed by manufacturer's 1-Year Limited Warranty

Specifications

• Flange inside diameter: 3.0 in (76 mm)
• Base outside diameter (large end): 5.0 in (127 mm)
• Top outside diameter: approx. 4.625 in (117 mm)
• Height: 4.0 in (102 mm)
• Flange length: 1.75 in (44 mm)
• Filter media: multi-layer premium cotton gauze
• Washable/reusable: Yes
• Weight: approx. 1.2 lb (0.5 kg)
• Warranty: 1-Year Limited

Included Components

• 1x Universal clamp-on air filter (Part No. RU-3700)
• Installation instructions/documentation

Product Description

The K&N RU-3700 Universal Clamp-On Air Filter offers a versatile upgrade for custom intake setups, performance vehicles, and non-stock configurations. With a 3.0" (76 mm) inside diameter flange, this filter fits a broad range of applications - whether you're working on a car, truck, ATV, generator, or other equipment that uses a clamp-on filter. Built with high-flow, washable cotton gauze media and a durable molded rubber flange for vibration absorption and secure fitment, it's engineered for improved performance and longevity.

Installation is straightforward: measure your intake pipe to confirm you have an approximately 3.0" inside diameter flange, slide the RU-3700 filter onto the flange, clamp securely, and you're ready. The washable and reusable design means you save on long-term replacement cost while maintaining high-quality filtration and improved airflow. Because this is a universal fit part (not tied to a specific make/model/year), it's ideal for custom builds and aftermarket intakes - but always verify clearance and fitment in your engine bay or intake system before purchase.