Keep your mower running smoothly with the Briggs & Stratton Air Filter Cartridge 5050K. Made to fit 12.5-20 HP horizontal L-head and most Vanguard V-twin engines. Air filters prevent dirt and debris from getting into your equipment s engine to ensure optimal performance of your lawn mower tractor. Check with your manufacturer before installing this Briggs and Stratton air filter to make sure it is the right fit and refer to your user manual to ensure proper installation. Stay on top of your mower maintenance with this replacement part.