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K&N Unique Air Filter - Replacement Element for RK-3931
K&N Unique Air Filter - Replacement Element for RK-3931
K&N Unique Air Filter - Replacement Element for RK-3931
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K&N Unique Air Filter - Replacement Element for RK-3931

Marsoni M251S
Sale price$83.99
Pay 4 payments of $21.00 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
K&N Unique Air Filter - Replacement Element for RK-3931The K&N replacement air filter for RK Series air cleaner assemblies is designed to increase horsepower and acceleration while providing excellent filtration. The air filter is washable and reusable and designed to be used as a replacement air filter for specific K&N RK Series air cleaner assemblies for Harley Davidson motorcycles. The air filter is covered by the famous K&N Million Mile Limited Warranty.
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Your K&N Unique Air Filter - Replacement Element for RK-3931 orders ship within 1-2 business days.

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

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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
4.4 ★★★★★
Based on 536 reviews
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Product Reviews
H
Verified Purchase
Holly H.
Los Angeles, US
★★★★★ 5
Lover her
Style: Refill
Absolutely love this product for my combination skin. It works really well for me as a makeup primer! I'v bought the refill a few times already!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 3, 2026
J
Verified Purchase
JM
Battle Creek, US
★★★★★ 4
Love the moisturizer, hate the smell
Style: Jar
I received a sample of this in an ipsy box and loved it. I have combination/dry skin, and this is so moisturizing. It also works well under makeup. The smell is terrible though--reminds me of am old perfume, and it's hard for me to ignore. I would absolutely rate this 5 stars if they got rid of the fragrance.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 2, 2024
Y
Verified Purchase
Yeimi brito Brito
New York, US
★★★★★ 5
Crema
Style: Jar, Style: Jar
Super good I used it everyday, and I’m starting to see the difference now.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2026
M
Verified Purchase
Mirtha
Battle Creek, US
★★★★★ 5
He leaves me my face of baby
Style: Refill, Style: Refill
I love this product
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 13, 2026
A
Verified Purchase
Amazon Customer
Louisville, US
★★★★★ 5
Recommended by Dermatologist
Style: Jar
I love this cream & have also ordered the refills. Same price as the company website but free shipping makes a difference
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 28, 2026

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