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K&N 25-3900 Air Filter Foam Wrap

Filter Wraps > Air Filter Foam Wrap
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   5.0 out of 5 stars   2 Customer Reviews
  • Extends service interval of your filter in very dusty conditions
  • Large open cell foam construction stops 90% of dirt with very low air restriction
  • Cleanable with K&N Filter Cleaner or soap and water
  • This product wraps your air filter with an additional pre-filter
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.

[More Information on AirForce Foam Wraps]

Available Information

Product Specifications

Wrap TypeAirforce Pre-Cleaner
Material UsedFoam
Width7 in (178 mm)
Length48 in (1219 mm)
Package Contents1 Airforce Pre-Cleaner Wrap
Package Quantity1
Product StyleFilter Wrap - Universal
Weight0.4 lb (0.2 kg)
Product Box Height15.1 in (384 mm)
Product Box Length8.2 in (208 mm)
Product Box Width5.6 in (142 mm)

K&N 25-3900 Air Filter Foam Wrap Product Reviews

Monday, February 12, 2018 - Part 25-3900
Not the designed usage. It's inside the fine copper mesh of an air filter (actually, a stone guard) on a 1930 Pierce-Arrow. I added some hardware cloth shaped like an open-ended cylinder inside, unseen, to prevent carburetor suction from pulling the filter material inward. Final installation looks factory but has actual filtration. Used this after not finding a manufactured cylindrical K&N filter to fit the dimensions of the factory can.

George Teebay
San Leandro, California
Thursday, September 21, 2017 - Part 25-3900
This product replaces your version of the Outer Wear, which was no longer usable after 1 season. I hope this wrap works better than the K&N outer wear did.

Marvin Shaw
Yarnell, Arizona