K&N RU-2690 Round Tapered Universal Clamp-On Air Filter, 1-3/4in Flange

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 1.75 in. flange diameter; rubber flange can stretch up to 1/16 in. to accommodate in-between sizes
• As a universal-fit part, some applications may require minor modification to achieve a proper fit
• Not a direct factory drop-in for any specific make or model - match your carburetor throat OD to the filter's ID before ordering

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
• Compact round tapered (conical) design suited to small-displacement engines and tight-clearance applications
• 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, rated for approximately 75,000 miles between cleanings
• Pre-oiled and ready for easy installation
• Backed by a 1-year limited warranty

Specifications

• Shape: Round Tapered (Conical)
• Filter Material: Cotton gauze
• Flange (Inside) Diameter: 1.75 in.
• Base Outside Diameter: 3 in.
• Top Outside Diameter: 2 in.
• Height: 2.5 in.
• Top Style: Rubber
• Weight: Approximately 0.3 lb.
• Fitment Type: Universal clamp-on

Included Components

• 1x K&N RU-2690 Round Tapered Universal Air Filter
• 1x K&N 1/2 oz. Filter Oil

Product Description

The K&N RU-2690 is a compact, round tapered universal air filter designed to mount directly onto a carburetor throat or intake neck rather than a single vehicle's factory air box. With a 1.75 in. flange diameter and a small 2.5 in. overall height, it's well suited to small-displacement engines, tight-clearance applications, and equipment like generators, snowmobiles, and tractors.

Built from four layers of cotton gauze treated with K&N's tacking agent, the RU-2690 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, and the filter ships with a bottle of K&N's filter oil for maintenance.

This filter is a good fit for builders and enthusiasts working on small carbureted engines or custom intake setups where space is limited and a compact conical filter is needed rather than a factory-specific replacement. Since it's a clamp-on universal filter, match your carburetor throat's outside diameter to the filter's 1.75 in. inside diameter before ordering, and note that as a universal part, some installations may require minor fitting adjustments.