K&N Airforce Foam Pre-Cleaners

K&N Filter Wrap Search by Dimension

What is a K&N Airforce Pre-Cleaner®

The K&N Airforce Pre-Cleaner is a specially designed foam filter wrap made to extend the service interval of your K&N Filtercharger when used in very dusty conditions.

Red colored pre-cleaners are made from large, open cell foam that is oiled. They will stop 90% of the dirt, yet only add a 2% restriction to the airflow of the filter. Our red colored Airforce Pre-Cleaners are designed to be cleaned with K&N Cleaner or soap & water then re-oiled with K&N air filter oil.  These pre-cleaners are custom made to fit each application, and there are four universal cut-to-fit sizes available.

Gray colored pre-cleaners are made with smaller foam cells that do not use oil.  They are designed to be cleaned with K&N Air Filter Cleaner or soap & water.
K&N Airforce Foam Pre-Cleaners
K&N Gray Oil-free Airforce Pre-cleaner

 ROUND SHAPE

Description                 K&N FilterCharger® Applications             Part #
Red 3" I.D. x 2-1/2" H      All 3"O.D. x 2-1/2" H filters              25-1480
Red 3-3/4" I.D. x 6" H      All 3-1/2 & 4"O.D. filters up to 6" long   25-1770
Red 4-1/2" I.D. x 1-1/2" H  RU-0330, RU-0340, RC-0330, RC-0340         25-0330
Red 14" I.D. x 4" H         All 14" O.D. X 4" H filters                25-3750
Red 14" I.D. x 5" H         All 14" O.D. X 5" H filters                25-3760
Red 14" I.D. x 6" H         All 14" O.D. X 6" H filters                25-3770
Gray 16" I.D. x 3" H        All 16" O.D. x 3" H filters                25-5200
Gray 16" I.D. x 4" H        All 16" O.D. x 4" H filters                25-5300
Gray 16" I.D. x 5" H        All 16" O.D. x 5" H filters                25-5400

 CONICAL SHAPE 

Description                             K&N FilterCharger® Applications             Part #
Red 3.125" I.D., 3" I.D. top, 3.375" H  SU-2391                                    25-2588
Red 6" I.D., 5" I.D. top, 9" H          RE-0810,RE-0870,RE-0910,RU-2510,RU-2520    25-0810
Red 6" I.D., 5" I.D. top, 14" H         RE-0800,RE-0820,RE-0860,RE-0880            25-0880
Red 7" I.D., 4.5" I.D. top, 4.875" H    YA-6601                                    25-6601
Gray 8" I.D., 6 5/8" I.D. top, 12" H    RC-5166,RC-5169,RC-5171                    25-5166

OVAL SHAPE (Red)

Description                  K&N FilterCharger® Applications                                  Part #
3-1/4"x4-1/2" I.D., 1-1/2"H  All 3-1/4" x 4-1/2" oval custom air cleaner assemblies 1-1/2" H  25-4250
4-1/4"x5-1/2" I.D., 2" H     All 4-1/4" x 5-1/2" oval custom air cleaner assemblies 2" H      25-1691
4-1/2"x7" I.D., 3-1/4" H     All 4-1/2" x 7" oval custom air cleaner assemblies 3-1/4" H      25-3340
4-1/2"x7" I.D., 6" H         All 4-1/2" x 7" oval custom air cleaner assemblies 6" H          25-3346
5-1/2"x9" I.D., 3-1/4" H     All 5-1/2" x 9" oval custom air cleaner assemblies 3-1/4" H      25-3460
5-1/2"x9" I.D., 6" H         All 5-1/2" x 9" oval custom air cleaner assemblies 6" H          25-3490
9"x20" I.D., 3" H            All 9" x 20" oval custom air cleaner assemblies 3" H             25-1963
9"x20" I.D., 4-1/2" H        All 9" x 20" oval custom air cleaner assemblies 4-1/2" H         25-1964
9"x20" I.D., 6" H            All 9" x 20" oval custom air cleaner assemblies 6" H             25-1966

UNIVERSAL SHAPE (Red)

Description          K&N FilterCharger® Applications                                          Part #
7" wide x 48" long   Cut to fit a variety of applications, secure w/velcro strips (included)  25-3900
18" wide x 48" long  Cut to fit a variety of applications, secure w/velcro strips (included)  25-3918
24" wide x 48" long  Cut to fit a variety of applications, secure w/velcro strips (included)  25-3924
30" wide x 48" long  Cut to fit a variety of applications, secure w/velcro strips (included)  25-3930

K&N PreCharger and DryCharger Air Filter Wraps