K&N RU-0820 Round Cotton Gauze Universal Clamp-On Air Filter, 2-7/16in FLG

Vehicle Fitment

• Universal - not vehicle-specific; designed for a wide range of applications including racing vehicles, small engines, generators, snowmobiles, and tractors

Fitment Notes

• Clamp-on design fits carburetor or intake necks matching the 2.438 in. flange diameter; rubber flange can stretch up to 1/16 in. to accommodate in-between sizes
• Not a direct factory drop-in for any specific make or model - match your carburetor throat OD to the filter's ID before ordering
• Filter color is listed as red by one retailer but is not confirmed consistently across sources, including K&N's own listing

Features

• Four layers of premium cotton gauze treated with a specially designed tacking agent
• Intricate filter media mesh designed to block and trap harmful contaminants
• Ultra-strong molded pliable rubber flange absorbs vibration for a secure attachment
• Flange can stretch up to 1/16 in. (1.5mm) to fit in-between sizes
• Washable and reusable, built to last with rugged, durable construction
• Rubber top styling for a finished, functional design
• Emissions legal in all 50 US states; will not void US automotive vehicle warranty
• Pre-oiled and ready for easy installation
• Backed by K&N's Million-Mile Limited Warranty

Specifications

• Shape: Round Straight
• Filter Material: Cotton gauze
• Flange (Inside) Diameter: 2.438 in.
• Flange Length: 0.625 in.
• Flange Type: Centered
• Outside Diameter: 3.5 in.
• Height: 6 in.
• Top Style: Rubber
• Re-Oiling Amount: 0.67 oz.
• Weight: 0.67 lb.
• Fitment Type: Universal clamp-on

Included Components

• 1x K&N RU-0820 Universal Clamp-On Air Filter

Product Description

The K&N RU-0820 is a compact universal clamp-on air filter designed to mount directly onto a carburetor throat or intake neck rather than a single vehicle's factory air box. With a 2.438 in. flange diameter and 6 in. overall height, it's well suited to smaller-displacement engines, racing applications, and equipment like generators, snowmobiles, and tractors.

Built from four layers of cotton gauze treated with K&N's tacking agent, the RU-0820 is engineered to trap contaminants while supporting strong airflow for a boost in horsepower and acceleration. The pliable rubber flange absorbs vibration for a secure hold and can stretch slightly to accommodate intake necks that fall between standard sizes.

This filter is a good fit for builders and enthusiasts working on carbureted engines, small equipment, or custom intake setups who need a compact, universal round filter rather than a factory-specific replacement. Because it's a clamp-on universal filter, match your carburetor throat's outside diameter to the filter's 2.438 in. inside diameter before ordering to ensure proper fit.