10 Pack 491588S Air Filter, Compatible with 491588 4915885 Flat OEM Air Cleaner Cartridge, Lawn Mower Air Filter

What It Is

This is a 10-pack of 491588S flat foam air filters designed for small engines in lawn mowers, tractors, and zero-turn mowers. They replace the OEM air cleaner cartridge to keep dust and debris out of the carburetor.

Fitment & Compatibility

• Cross-references: Directly replaces OEM part numbers 491588, 4915885, and 491588S. Fits many Briggs & Stratton, Craftsman, Husqvarna, John Deere, and MTD engines with a flat foam cartridge.
• Measure before buying: The filter is roughly 4.5 x 2.5 x 0.5 inches. Check your existing filter dimensions—if it’s thicker, curved, or round, this won’t fit.
• Check your engine model: Common on single-cylinder engines (e.g., 500E, 550E, 625E series) and many 10–20 HP lawn tractors. Verify your engine’s air filter part number against 491588 in your manual or online.
• OEM vs aftermarket: This is an aftermarket pack. It’s identical in fit and function to OEM but costs less per filter.

Key Things to Know

• Quality: Dense foam that seals well and traps fine dust. No pre-oiling required—just install dry.
• Installation: Takes 30 seconds. Remove the cover, swap the dirty filter, and reattach. No tools needed.
• Common gotcha: Some engines use a pre-filter (foam wrap) in addition to this cartridge. If your setup has a separate pre-filter, this pack doesn’t include it.
• 10-pack value: Great if you have multiple mowers or plan to replace seasonally. Store extras in a dry, cool place to prevent foam degradation.

Should You Buy It

Buy if you need a reliable, cheap replacement for a 491588-style flat air filter and want a 10-pack to stock up. Skip it if your mower uses a pleated paper filter, a round foam filter, or needs a pre-filter included.