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K&N filter minders work as air filter service indicators that monitor air filter restriction and indicate when the air filter should be serviced. As the air filter gets dirty, the yellow position indicator moves in the clear window of the service indicator and locks at the highest point. It can be read even after the engine is turned off. The air filter should not be cleaned until the yellow position indicator reaches the red zone.

Product Features:

• Monitors your K&N filter for air flow
• Indicates when the filter should be cleaned
• Easy to read, even after engine is off
• Available with 1/8 In. thread or grommet mount