A-B15429K-AI AIR FILTER W/PRE-CLEAOne New Aftermarket Replacement Air Filter with Pre Cleaner Fits Briggs & Fits Stratton Engines This aftermarket replacement air filter kit Fits Briggs & Fits Stratton (B&S) 9. 0 12. 5 HP OHV Model 21 and 4 cycle Intek single cylinder engines. The kit includes one round style, pleated paper air filter cartridge and one foam pre cleaner. Together, they protect the engine from dirt and debris ingestion, helping maintain performance and extend engine