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Washable and reusableEase of maintenanceHigh air flow with excellent filtrationIncreased performanceGrease provided for secure fitThe K&N E-4521 replacement air filter is constructed using an oil-free synthetic media. A tube of sealing grease is provided to help ensure an airtight seal. 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.