A-B15053K-AI FILTER-AIROne New Aftermarket Replacement Air Filter with Pre Cleaner Fits Briggs and Stratton (B&S) Small Engines This aftermarket replacement air filter kit services Fits Briggs and Stratton (B&S) small engines rated at 12. 5 to 17 HP. The kit includes one oval style pleated paper air filter cartridge and one foam pre cleaner, working together to protect the engine from dust and debris ingestion. Regular air filter replacement is a key maintenance task that