595663 Air Filter Base, 595660 Air Cleaner Cover & 799579 Foam Filter Compatible with 450E 500E 550E 550Ex Series Engine Lawn Mower Replacement Kit

What It Is

This three-piece replacement kit includes the air filter base (595663), air cleaner cover (595660), and foam pre-filter (799579) for Briggs & Stratton 450E, 500E, 550E, and 550Ex series engines. It’s the complete air intake assembly for push mowers, pressure washers, and other small equipment using these engines.

Fitment & Compatibility

• Engine series only: Works with Briggs & Stratton 450E, 500E, 550E, 550Ex. Check your engine’s model number (stamped on the blower housing or valve cover) – it must start with these series numbers.
• Not universal: Does not fit older or non-E series engines (e.g., 450, 500 without the “E” suffix) or engines from other brands like Kohler or Honda.
• OEM cross-reference: Replaces Briggs & Stratton parts 595663, 595660, and 799579. Measure the base mounting holes (roughly 3.5” center-to-center) and cover diameter (~4.5”) to confirm fit.
• Deck size irrelevant: Fitment depends entirely on the engine, not mower deck size.

Key Things to Know

• Foam filter only: The kit includes a foam pre-filter, not a paper cartridge. For dusty conditions, you may want to add a paper filter separately (Briggs 792079).
• Easy install: No tools needed – the base bolts onto the carburetor studs, and the cover clips on. Takes under 5 minutes.
• Check gasket condition: The kit does not include a base gasket. If your old gasket is torn or missing, order one separately (Briggs 691043) to prevent unfiltered air leaks.
• Common gotcha: The cover tabs can break if overtightened. Hand-tighten only.

Should You Buy It

If you have a Briggs 450E–550Ex engine with a cracked cover or missing foam filter, this kit is a cheap, direct replacement. It’s ideal for DIY repairs on push mowers or pressure washers where OEM parts cost more. Skip it if you need a paper filter or your engine isn’t an E-series.