Briggs & Stratton Air Filter - 399806S (4 Pack - 4138)

Key Features

• Genuine Briggs & Stratton OEM foam air filter designed to match original equipment specifications (Part references 399806S / 4138).
• Foam filtration element captures dust and debris while maintaining airflow essential for efficient combustion.
• Pack of 4 filters for routine servicing across multiple machines or as stocked workshop inventory.
• Supports engine longevity by reducing carburettor blockages and internal wear, contributing to smoother starts and more consistent running.
• Clear identification with part references to ensure accurate ordering and compatibility.
• Ideal for multi-machine households, contractors, service centres, or frequent users performing regular maintenance.

Product Details

• Product Type: Foam Air Filter / Air Cleaner Element
• Part References: 399806S (individual filter) | 4138 (4-pack SKU)
• Pack Quantity: 4 Filters
• Filtration Type: Foam
• Compatibility: Briggs & Stratton small petrol engines with matching foam air cleaner housings
• Application: Engine air filtration for carburettor protection and clean combustion
• Typical Fitment: single-cylinder horizontal engines such as 550E, 600 Series and similar variants; engines in the 6 hp to 10 hp range where a foam air filter housing is specified
• Fitment Tip: Air filter compatibility is determined by the engine’s exact model number and air cleaner housing design. Always check your engine’s model/tag and compare with your existing filter to confirm correct match before ordering.

Compatibility

• Designed for Briggs & Stratton small petrol engines that use a foam air cleaner housing
• Typical fitment examples include 550E, 600 Series and other single-cylinder horizontal engines in the 6–10 hp range with a foam filter housing
• Common applications encompass walk-behind lawn mowers, garden tractors, rotavators, and other petrol-powered outdoor equipment
• Verify compatibility by matching the engine model number and air cleaner housing design to the 399806S / 4138 references before purchase
• Stock-ready option for households or service operations needing bulk replacements across multiple machines