K&N RU-3250 Universal Clamp-On Air Filter 79mm Flange, Reusable High-Flow

Vehicle Fitment

• Universal fit - fits any vehicle intake with approx. 3.125 in (79 mm) inside diameter flange

Features

• Universal clamp-on design for a wide variety of vehicles and equipment
• High-flow cotton gauze media for improved horsepower and acceleration
• Washable and reusable filter for long-term use
• Molded rubber flange absorbs vibration and allows slight size flexibility
• Four-layer filter media for robust contaminant protection
• Easy installation - clamp onto intake pipe with correct diameter flange
• Reduces waste from disposable filters
• Backed by 1-Year Limited Manufacturer Warranty

Specifications

• Flange inside diameter: 3.125 in (79 mm)
• Filter height: 6 in (152 mm)
• Large end outside diameter: 5 in (127 mm)
• Top outside diameter: 3.5 in (89 mm)
• Filter media: premium cotton gauze, multi-layer
• Washable/reusable: Yes
• Weight approx.: 1 lb (0.4 kg)
• Warranty: 1-Year Limited

Included Components

• 1x Universal clamp-on air filter (Part No. RU-3250)
• Installation instructions/documentation

Product Description

Upgrade your engine's intake with the K&N RU-3250 Universal Clamp-On Air Filter. Designed to fit virtually any application with a 79 mm (3.125 inch) flange, this filter offers a high-flow, washable solution to improve performance and long-term value. Ideal for racers, custom builders, and performance-minded drivers who want reusable filtration and increased airflow.

The RU-3250 features a robust four-layer cotton gauze media inside a durable molded rubber flange that accommodates slight size variances and absorbs vibration. The washable design allows cleaning and reuse multiple times, reducing replacement cost and waste compared to disposable filters. Suitable for cars, trucks, ATVs, generators, or custom intake systems.

Installation is straightforward: measure your intake pipe to confirm a ~79 mm (3.125 in) inside diameter flange, clamp the filter securely, and it's ready to use. No vehicle-specific ECU remaps required. Verify fitment and clearance in your engine bay before installation.