Compatible with Briggs & Stratton Air Filter 796031, 591334, 594201, Pre-Filter 797704

What It Is

This is a compatible air filter and pre-filter set designed for Briggs & Stratton engines, replacing OEM part numbers 796031, 591334, 594201 (main filter) and 797704 (pre-filter). It traps dirt and debris before they enter the carburetor, critical for small engines on walk-behind mowers, riding mowers, and generators.

Fitment & Compatibility

Before buying, check your engine model number (stamped on the valve cover or blower housing). This set fits most Briggs & Stratton engines with a 4-5 inch round air filter housing, commonly found on Series 400, 450, 500, 550, 600, 625, 650, 675, 700, 725, 750, 775, 800, 850, 875, 900, and 1000 engines. Measure the existing filter diameter (approx. 4.5 inches) and height (approx. 1.5 inches). It will also work on some older Briggs engines using a foam pre-filter. Confirm your deck size doesn’t interfere with the housing—this is a universal engine part, not deck-specific. If your filter housing is rectangular or smaller than 4 inches, this won’t fit.

Key Things to Know

• Quality variance: This is a non-OEM filter. It may have slightly thinner foam or paper media than genuine Briggs & Stratton. Expect adequate filtration for residential use but not heavy-duty commercial.
• Installation: Simple—remove the old filter, clean the housing with a rag, and drop in the new one. No tools needed. The pre-filter slides over the main filter; ensure it sits flush.
• Common gotcha: The pre-filter (797704) is a foam wrap. If your engine doesn’t use one (some models omit it), you can run the main filter alone. But don’t install the pre-filter backward—the open side faces the engine.
• Check fitment first: Some aftermarket sets are slightly undersized and may rattle in the housing. If the filter doesn’t seat snugly, it can let unfiltered air bypass.

Should You Buy It

If you have a common Briggs & Stratton engine (like those on many Craftsman, Troy-Bilt, or MTD mowers) and want a budget-friendly replacement for seasonal home use, this set works fine. It’s not for commercial landscapers or high-dust environments—stick with OEM for those. For $19.99, it’s a solid value if you confirm fitment first.