A-B1597266-AI FILTER, AIR CLEANER FOAMOne New Aftermarket Replacement Foam Air Cleaner Filter Fits Briggs & Fits Stratton Small Engines This foam air cleaner filter (pre cleaner outer foam element) is a direct replacement Fits Briggs & Fits Stratton (B&S) small engines commonly found in walk behind lawn mowers, tillers, and other outdoor power equipment. The foam element works alongside the primary paper air filter to trap dust and debris before it reaches the carburetor and engine,