Pack of 15 Air Filter 491588S for 491588s 399959 4915885 Air Cleaner

What It Is

This is a 15-pack of aftermarket air filters (model 491588S) designed for small engines, primarily in lawn mowers, tractors, and zero-turn mowers. It replaces OEM part numbers 491588s, 399959, and 4915885.

Fitment & Compatibility

Before buying, confirm your engine’s air filter housing accepts a rectangular filter measuring approximately 3.5 x 2.25 x 0.75 inches. This filter fits many Briggs & Stratton, Craftsman, Husqvarna, and MTD models (e.g., 500e series, 550e series). Check your owner’s manual or existing filter for the exact OEM number. It does NOT fit all engines—verify deck size is irrelevant; focus on engine make and model. Aftermarket filters may vary slightly in foam density or paper thickness compared to OEM.

Key Things to Know

• Quality: Users report good filtration and fit, but foam may be slightly less dense than OEM. Replace every 25 hours or seasonally, sooner in dusty conditions.
• Installation: Simple—remove old filter, clean housing, insert new one. No tools needed.
• Gotcha: The 15-pack is bulk; store extras in a dry, sealed bag to prevent dust contamination.
• Gotcha: If your engine uses a pre-filter (foam wrap), this pack includes only the paper/filter element, not the foam.

Should You Buy It

If you have multiple small engines (mowers, tractors, generators) that use this common filter size, this pack offers good value for routine maintenance. It’s ideal for users who want spare filters on hand and don’t require OEM-specific foam density. Skip it if you need exact OEM fit for a warranty or high-dust commercial use.