K&N Filter Universal Rubber Filter 3.75in Flange ID / 5.375in Base OD / 4.375in Top OD / 5in Height

K&N Filter Universal Rubber Filter 3.75in Flange ID / 5.375in Base OD / 4.375in Top OD / 5in Height

Marsoni

M251S

$75.99

Get it in 3 business days with 1 day shipping. Friday, May 29

K&N Filter Universal Rubber Filter 3.75in Flange ID / 5.375in Base OD / 4.375in Top OD / 5in HeightSKU: RU 4250 UPC: 024844045164 K&N Filter Universal Rubber Filter 3. 75in Flange ID 5. 375in Base OD 4. 375in Top OD 5in Height K&N RU 4250 universal clamp on air filter fits racing vehicles radio controlled cars generators snowmobiles tractors and custom intakes regardless of angle or offset. Molded rubber flanges absorb vibration stretch up to 1 16 inch for secure fit. Washable reusable design traps contaminants while boosting airflow for more

Easy Shipping

Quick Dispatch:

Your K&N Filter Universal Rubber Filter 3.75in Flange ID / 5.375in Base OD / 4.375in Top OD / 5in Height orders ship within 1-2 business days.

Delivery Options:

Standard: 3-7 business days
Fast: 2-3 business days
Express: 1-2 business days

Order Tracking:

You'll receive a tracking link by email once your K&N Filter Universal Rubber Filter 3.75in Flange ID / 5.375in Base OD / 4.375in Top OD / 5in Height ships.

Need Help?
Questions about K&N Filter Universal Rubber Filter 3.75in Flange ID / 5.375in Base OD / 4.375in Top OD / 5in Height, sizing, or delivery? We're just an email away.

Live Shipping Estimates:
Enter your location at checkout to see available shipping methods and costs for K&N Filter Universal Rubber Filter 3.75in Flange ID / 5.375in Base OD / 4.375in Top OD / 5in Height in your area.

Get Shipping Estimates

Country Zip/Postal Code

Exchange/Return Notes

We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
To process your return/exchange, please contact us at [email protected]
Please click here for more details>>> Return & Exchange Policy

This filter looked about the same as the OEM filter. It installed in about a minute. The quality appeared to be fine. It was protected in a cardboard box. It fit my 2014 Subaru Outback perfectly. I just installed it an hour ago so I don’t have any long term observations about longevity or effectiveness. I can’t see any reason why it would not work as well as the original, it seemed identical.

WAS THIS REVIEW HELPFUL?YesReportShare

Reviewed in the United States on May 29, 2026

Verified Purchase

Nicholas K

Houston, US

★★★★★ 5

Great filter

Size: AF259

This fit my Mazda CX-5 perfectly. I'm happy with the seal and quality. Great price. I will certainly reorder for my next replacement.

WAS THIS REVIEW HELPFUL?YesReportShare

Reviewed in the United States on May 19, 2026

Verified Purchase

Amazon Customer

Bozeman, US

★★★★★ 5

Great fit and quality

Size: AF113

Not a complicated product, but after going to 2 different auto parts stores and this not being in stock, Amazon to the rescue. Arrived the next day and the quality is definitely on par with “store brand” ones from retailers. Definitely cheaper as well.

WAS THIS REVIEW HELPFUL?YesReportShare

Reviewed in the United States on April 23, 2026

Verified Purchase

Port Orchard, US

★★★★★ 5

Fit my 2014 Accord perfectly

Size: AF476

Seems to be the same quality as OEM. Fit perfectly. Easy to install.

WAS THIS REVIEW HELPFUL?YesReportShare

Reviewed in the United States on April 24, 2026

Verified Purchase

Becca