Briggs & Stratton 394018S Air Filter

The Briggs & Stratton 394018S is a heavy-duty, pleated-paper air filter cartridge primarily used for Vanguard V-Twin and L-Head twin-cylinder engines. It is a critical component for maintaining clean airflow and protecting your engine from abrasive debris.
Technical Specifications
Filter Type: Pleated paper, round cartridge.
Outer Diameter: 7-1/8 inches (approx. 180mm).
Inner Diameter: 5-1/2 inches (approx. 140mm).
Height: 2-1/4 inches (approx. 55mm).