K&N RU-1720 Round Cotton Gauze Angled 20 Deg Universal Air Filter, 2-1/4in 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 2.25 in. flange diameter; the flange is angled at 20 degrees for offset or non-perpendicular intake orientations
• 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 2.25 in. ID and confirm the 20-degree angle suits your intake orientation 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
• 20-degree angled flange accommodates offset or angled intake setups that a straight flange can't reach cleanly
• 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
• 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: 2.25 in.
• Flange Angle: 20 degrees
• Flange Length: 1 in.
• Outside Diameter: 3.5 in.
• Height: 6 in.
• Top Style: Rubber
• Fitment Type: Universal clamp-on

Included Components

• 1x K&N RU-1720 Angled Universal Clamp-On Air Filter

Product Description

The K&N RU-1720 is a compact universal clamp-on air filter with a 20-degree angled flange, designed to mount directly onto a carburetor throat or intake neck that isn't perfectly straight. With a 2.25 in. flange diameter and 6 in. overall height, it's well suited to custom carbureted setups, small engines, and racing applications where intake geometry calls for an angled connection.

Built from four layers of cotton gauze treated with K&N's tacking agent, the RU-1720 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 or custom intake setups where the intake neck sits at an angle rather than straight on, making a standard centered-flange filter impractical. Since it's a clamp-on universal filter, match your carburetor throat's outside diameter to the filter's 2.25 in. inside diameter and confirm the 20-degree angle suits your intake orientation before ordering.