K&N 25-3918 | Air Filter Wrap

Part Number
Air Filter Foam Wrap
Special Price $73.09 Regular Price $85.99
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The K&N Airforce Pre-Cleaner is a specially designed foam filter wrap made to extend the service interval of your K&N air filter when used in very dusty conditions. The Airforce Pre-Cleaner is designed to be cleaned with K&N Cleaner or soap & water. Red colored Airforce pre-cleaners are oiled with K&N air filter oil after they are cleaned. They are made from large, open cell foam. Gray colored Airforce pre-cleaners do not use oil. They have smaller foam cells.



  • Cleanable With K&N Filter Cleaner or Soap And Water
  • Air Filter Foam Wrap
  • Large Open Cell Foam Construction
  • Air Filter Foam Wrap
  • Extends Service Interval Of Your Filter
  • The K/N Airforce pre-cleaner is a specially designed foam filter wrap made to extend the service interval of a K/N air filter when used in very dusty conditions. Red colored pre-cleaners are oiled while gray colored pre-chargers are not.
  • Stops 90 Percent Of Dirt With Very Low Air Restriction
  • Wraps Your Air Filter With An Additional Pre-Filter


Automotive Item GradeHigh Performance
Item Height18.000 in.
Item Weight0.200 lbs. (0.1 kg)
Length48.000 in. (1219mm)
Overall Length48.000 in.
Package Content1
Package Contents1 Airforce Pre-Cleaner Wrap
Package MaterialPlastic Other
Package Quantity1
Package TypeBag
Product Box Height21.500 in. (546mm)
Product Box Length17.000 in. (432mm)
Product Box Width2.000 in. (51mm)
Prop 65 (C, R or CR)CR
Prop 65 Warning Labelhttps://www.knfilters.com/images/l/prop65.jpg
TitleK&N 25-3918 Air Filter Foam Wrap
WARNING CA Proposition 65Yes
WARNING CA Proposition 65 MessageWARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Width18.000 in. (457mm)
Wrap TypeAirforce Pre-Cleaner


Customer Questions
Can K&N filters get wet?
No, K&N filters should not get wet.
When to clean K&N air filter?
K&N air filters should be cleaned approximately every 50,000 miles (80,000 kilometers) or as recommended by the manufacturer.
Will K&N filter increase mpg?
It is possible for a K&N air filter to slightly improve fuel efficiency (MPG) under certain conditions.
What does K&N mean?
K&N stands for the names of the two founders of the company, Ken Johnson and Norm McDonald.
Please, mind that only logged in users can submit questions

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