How often should I clean this filter?

K&N recommends cleaning and re-oiling your filter every 50,000 miles for street use. You'll want to inspect it more often in dusty conditions. A visual inspection will tell you when it's time.

What do I use to clean and re-oil this filter?

K&N sells recharge kits that include both cleaner and oil, formulated specifically for their filter media. Using other oils can damage the filter.

Does this filter come pre-oiled?

Yes, this filter comes pre-oiled and ready to install. You only need to oil it after cleaning.

K&N Universal Tapered Filter 3in Flange ID x 6in Base OD x 4in Top OD x 6.75in Height

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Specifications

Brand: K&N
Part #: RU-4700
UPC: 024844373700

K&N Universal Tapered Filter 3in Flange ID x 6in Base OD x 4in Top OD x 6.75in Height

Name: K&N Universal Tapered Filter 3in Flange ID x 6in Base OD x 4in Top OD x 6.75in Height
Brand: K&N
Price: 78.99 USD
Availability: InStock

$78.99

On Backorder — Expected to ship by Apr 3, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Universal fit air filter for custom intakes. Washable and reusable.

Key Features

Washable filter media — clean and re-oil for extended life
Universal fit — works on many custom intake setups
Pliable rubber flange — creates a tight seal, even on slightly mismatched pipes

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Will this fit your vehicle?

Product Details

K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications. Regardless of the angle or offset diameter of the air intake, there is probably a K&N Universal air filter for your equipment. All filters are constructed with ultra-strong molded pliable rubber flanges which absorb vibration and allow for secure attachment and can also be stretched for up to 1/16 of an inch (1.5mm) to fit in-between sizes. K&N universal air filters are washable and reusable.