How often should I clean this filter?

That depends on your driving conditions. Inspect the filter regularly, and clean it when you see a buildup of dirt and debris. K&N sells a cleaner specifically for the Dryflow synthetic media used in this filter.

What is the flange size on this filter?

The filter has a 6-inch inside diameter flange. The base outside diameter is 7.5 inches, the top outside diameter is 5.25 inches, and the height is 8 inches.

Does this filter come pre-oiled?

No, this filter uses K&N's Dryflow synthetic media, which is designed to be run dry. Oiling this filter will reduce airflow and could damage the filter material.

K&N Universal Rubber Filter Round Tapered 6in Flange ID x 7.5in Base OD x 5.25in Top OD x 8in Height

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Specifications

Brand: K&N
Part #: RU-3101HBK
UPC: 024844334343

K&N Universal Rubber Filter Round Tapered 6in Flange ID x 7.5in Base OD x 5.25in Top OD x 8in Height

Name: K&N Universal Rubber Filter Round Tapered 6in Flange ID x 7.5in Base OD x 5.25in Top OD x 8in Height
Brand: K&N
Price: 83.99 USD
Availability: InStock

$83.99

On Backorder — Expected to ship by Apr 2, 2026

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

Universal K&N air filter with washable Dryflow media. Clamp-on design fits a variety of applications.

Key Features

Washable filter — can be cleaned and reused
Dryflow synthetic media — oil-free for easy cleaning
Universal fit — designed for a variety of applications

⚠️ 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 Black Universal Air Filters are made from Dryflow oil-free synthetic media. These low restriction clamp-on air filters are designed and manufactured for a wide variety of applications. When dirty they can be easily washed using K&N synthetic air filter cleaner.