Briggs & Stratton Base-Air Cleaner 398592 Genuine OEM. This is a Genuine OEM Briggs & Stratton part. Choose this manufacturer-approved air filter pipe for your engine. This air filter pipe for a Briggs and Stratton single-cylinder engine attaches to the air filter at one end and the air intake of the car... - Briggs & Stratton Base-Air Cleaner 398592 Genuine OEM.