799579 Foam Air Filter Replacement B&S 5434 4248 09P000 08P000 Lawn Mower Air Cleaner for 550E-550Ex Series Engine (2)

What It Is

This is a foam air filter replacement for Briggs & Stratton 550E, 550Ex, and similar series engines (models 5434, 4248, 09P000, 08P000). It fits push mowers, walk-behinds, and other small engines using a round foam air cleaner element.

Fitment & Compatibility

Check your engine model number – this fits B&S 550E and 550Ex series engines only. Not for 450E or 625Ex.
OEM cross-references: Replaces B&S 799579, 5434, 4248, 09P000, 08P000.
Measurements: Outer diameter ~3.25", inner hole ~1.5", height ~1.75". Measure your old filter to confirm.
Brand/Model: Works with Troy-Bilt, Craftsman, MTD, Husqvarna, and other mowers using those B&S engines. Deck size irrelevant – engine model is what matters.

Key Things to Know

• Pre-oil before use: Foam filters must be lightly oiled (use foam filter oil or engine oil) to trap fine dust. Running dry reduces filtration.
• Installation: Push firmly over the air cleaner stud, secure with the nut or retainer. No tools needed.
• Cleaning: Wash with warm soapy water, dry, re-oil. Replace every season or after heavy use.
• Common gotcha: Some mowers have a paper filter underneath – this foam filter is the outer pre-filter, not a replacement for the paper element. Check your setup.

Should You Buy It

Yes, if you own a B&S 550E/550Ex push mower and need a cheap, reliable replacement. It’s a direct fit, easy to install, and the high rating reflects consistent quality. Not for other engines or as a standalone filter if your mower uses a paper element.