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The K&N E-4521 replacement air filter is constructed using an oil-free synthetic media. The E-4521 provides superior filtration, protecting your equipment's engine. This K&N air filter can be cleaned and used again. The E-4521 air filter fits some Kohler, Toro Multi Pro and John Deere equipment, in addition to other applications.


  • Washable and reusable
  • Ease of maintenance
  • High air flow with excellent filtration
  • Increased performance


Height: 2.5in (64mm)

Inside Diameter: 5.5in (140mm)

Outside Diameter: 7in (178mm)


Compatiable with Kohler 




K&N 4521 Air Filter

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