K&N RU-1042 Universal Clamp-On Air Filter, 6-In Flange

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Product guide

K&N RU-1042 Universal Clamp-On Air Filter, 6-In Flange

The K&N RU-1042 is a washable, reusable universal clamp-on air filter with a 6-inch flange, intended for applications that match its fitment and dimensions. Its cotton-gauze media and reusable design may suit buyers looking to avoid frequent disposable-filter replacements, but the claimed performance benefits are not independently established here.

At a glance

Washable and reusable design, with multiple layers of cotton gauze and a tacking agent described as trapping contaminants.
Manufacturer claims cleaning is needed every 75,000 miles under normal highway driving conditions, or about five years at 15,000 miles per year.
The listing describes this as a universal filter for varied applications. Confirm the intake connection and available space before purchase.
Manufacturer states the filter is pre-oiled and ready for installation. Its separate description discusses clamp-on use, while a feature line refers to factory air-box drop-in installation.

Price

$63.19Save 20%

Reference price: ~~$78.99~~

Price checked: Nov 14, 2026

View offer

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Pros and cons

Pros

Reusable construction can reduce the need to replace disposable filters as frequently.
Customer feedback mentions straightforward installation and perceived performance, though actual fit depends on the specific application.
The listing provides a one-year limited warranty description.

Cons

Requires washing and re-use rather than replacement with a new disposable filter.
The universal-fit description does not establish compatibility with a particular vehicle or intake setup.

Technical specifications

13 specifications

Identity
Brand	K&N
Model	RU-1042
Fit type	Universal Fit

Dimensions and installation
Form factor	Round
Dimensions listed	8.4"L x 8.3"W x 8.6"H
Weight listed	1.5 pounds
Flange diameter	6 In
Filter height	6.5 In
Flange length	1 In
Shape listed in title	Round Tapered

Construction and care
Filter media	Multiple layers of premium cotton gauze
Cleaning interval claimed	75,000 miles under normal highway driving conditions (5 years based on the average miles driven per year of 15,000 miles)
Warranty description	1 Year Limited

What to know before buying

Listing details to confirm

Listing details are inconsistent: the title calls the filter round tapered, while the technical shape field says round, and the stated dimensions do not match the title's separate flange diameter, filter height, and flange length figures. Installation wording also varies between a clamp-on filter and a drop-in factory-air-box filter. Confirm the required shape, measurements, and mounting arrangement for your application before buying. The long cleaning interval is a manufacturer claim for normal highway driving, not a universal maintenance schedule.

What’s in the box

Included

Air filter

Who is it for?

A good fit for

Vehicle owners whose intake connection and available clearance match the filter's dimensions.
Buyers who prefer a washable, reusable air filter over frequent disposable replacements.
DIY installers comfortable checking fitment and handling cleaning and maintenance.

Less suited to

Buyers needing a confirmed vehicle-specific fit without checking intake measurements.
Those seeking a maintenance-free or disposable replacement filter.

K&N RU-1042 Universal Clamp-On Air Filter, 6-In Flange · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.7 / 5 · 869 ratings

5 stars87%87%
4 stars9%9%
3 stars2%2%
2 stars0%0%
1 star2%2%

Customer feedback reports perceived performance, easy installation, and good value. Those experiences may matter to buyers seeking a reusable intake filter, but they do not confirm performance gains or fit for a particular setup. The feedback is largely positive overall, while the aggregate ratings also include a small low-rating share and do not explain why customers rated it that way.

Positive themes

Customers report that the filter works well and is easy to install.
Customers describe it as good value for the price.

Frequently asked questions

Will the K&N RU-1042 fit my vehicle?

The listing calls it a universal-fit filter, but that does not confirm compatibility with a specific vehicle. Compare the required connection and available space with the listed dimensions, and clarify the shape discrepancy before ordering.

How often does it need cleaning?

K&N claims 75,000 miles under normal highway driving conditions, approximated as five years at 15,000 miles per year. That interval is a manufacturer claim and may not apply to every driving environment.

Is the filter reusable?

Yes. The listing describes it as washable and reusable, and says it uses multiple layers of cotton gauze. It also states the filter is pre-oiled.

Does it install in a factory air box?

The listing's installation language is inconsistent. One feature mentions dropping it into a factory air box, while the title and product description call it a universal clamp-on filter. Confirm the mounting method for your intended application.