Product guide

K&N RU-3113HBK Dryflow Universal Clamp-On Air Filter, 4-In Flange

The K&N RU-3113HBK Dryflow universal clamp-on air filter uses black, oil-free synthetic media and is described as washable and reusable. Its listed 4-inch flange and 6-inch filter height make fit dimensions the key check before purchase.

At a glance

Dry, oil-free synthetic media in black.
The filter is described as washable and reusable, with K&N synthetic air filter cleaner specified for washing when dirty.
The listed flange diameter is 4 inches, with a 6-inch filter height and 1.75-inch flange length.

Price

$55.19Save 20%

Reference price: ~~$68.99~~

Price checked: Nov 14, 2026

View offer

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Pros and cons

Pros

Oil-free media avoids an oiling step in the stated care description.
Washable and reusable construction allows cleaning rather than routine replacement, subject to suitable cleaning and fit.

Technical specifications

15 specifications

Identity
Brand	K&N
Model	RU-3113HBK
Product type	Universal Clamp-On Air Filter
Fit type	Universal Fit
Product grade	Replacement Part

Construction and dimensions
Media type	Dry Synthetic
Filter media	Black synthetic media
Flange diameter	4 In
Filter height	6 In
Flange length	1.75 In

Care and contents
Cleaning	Washable and reusable
Oil treatment	Oil-free air filter
Included components	1 Air Filter
Number of items	1

Warranty
Manufacturer warranty description	1 Year Limited

What to know before buying

Listing details to confirm

The listing title includes the token RC-3113HBK, while the model and OEM part number fields identify RU-3113HBK. Confirm the exact part number and dimensions against the intended intake before ordering.

What’s in the box

Included

1 air filter

Who is it for?

A good fit for

Buyers seeking a washable, oil-free synthetic clamp-on filter whose intake matches the listed 4-inch flange, 6-inch height and 1.75-inch flange length.
Owners who prefer a reusable filter and can clean it when dirty using the specified K&N synthetic air filter cleaner.

Less suited to

Buyers needing a vehicle-specific fit confirmation, since the listing gives a universal-fit designation rather than vehicle applications.
Buyers whose intake dimensions do not match the listed flange size and filter dimensions.

Customer reviews on Amazon

4.6 / 5 · 12 ratings

5 stars81%81%
4 stars13%13%
3 stars0%0%
2 stars0%0%
1 star6%6%

The supplied evidence contains aggregate ratings but no review-summary text, so it does not establish why customers rated the filter as they did. The distribution is mostly in the highest rating category, with a small one-star share. That provides limited overall sentiment context, not evidence about fit, filtration or cleaning performance for a particular setup.

Frequently asked questions

What are the listed dimensions?

The listing gives a 4-inch flange diameter, 6-inch filter height and 1.75-inch flange length. Compare these with the intake connection and available clearance.

Does this filter need oil?

It is described as an oil-free filter with dry synthetic media.

How is the filter cleaned?

The listing says it can be washed when dirty and specifies K&N synthetic air filter cleaner.

Which part number should I confirm?

The title contains RC-3113HBK, but the model and OEM part number fields say RU-3113HBK. Confirm the exact part identity with the selected listing before buying.