Keep your engine running clean and protected with this genuine OEM Briggs & Stratton air filter and pre-filter combo. Designed for select 9.0 and 12.5 HP 21 series OHV engines, this kit helps extend engine life by preventing dirt and debris from entering the carburetor. Equivalent to Briggs & Stratton 5429K. ✔ OEM Briggs & Stratton quality✔ Includes both air filter + pre-filter✔ Exact fit — no guesswork What’s Included: (1) Air Filter — 591583 (1) Pre-Filter — 798911 Fits select Briggs & Stratton engines including: 21 Series Engines Not sure if this fits your engine? Use our Engine Model Lookup Tool or check your model number stamped on the valve cover. Why this matters: Dirty air filters are one of the most common causes of: Hard starting Loss of power Excess fuel consumption Black smoke Replacing both the air filter and pre-filter together ensures maximum airflow and engine protection.
