filtration performance Our air filters are made of filter paper reinforced with a metal mesh, delivering exceptional filtration and effective capture of dust and debris. This helps protect the engine by preventing debris from entering the intake and maintaining steady airflow. fitment Compatible with mower models 491588, 399959, and 491588S. Designed to fit the air intake housing precisely, ensuring a proper seal and performance. Construction and durability Constructed with filter paper and reinforced by a sturdy metal mesh. This combination provides longlasting durability and reliable airflow throughout the service life of the filter. Key attributes Function: air filtration for lawn mower engines Material: filter paper and metal mesh Compatibility: 491588, 399959, 491588S Performance: filtration efficiency and durable airflow Why you need it Protects the engine by filtering dust and debris before it enters the intake, helping maintain mower performance. Supports consistent airflow, reducing the likelihood of reduced power or increased engine wear. Provides reliable, longlasting filtration suitable for routine maintenance and demanding mowing conditions. Use scenarios Routine maintenance for mower models 491588, 399959, and 491588S during regular seasonal care. Mowing in dusty or debrisrich environments such as dirt roads, construction sites, or after heavy leaf fall. Seasonal yard cleanup or heavyduty mowing where higher debris exposure is expected.