A-B1491435S-AI FILTER-PRE CLEANEROne New Aftermarket Replacement Pre Cleaner Filter Fits Briggs and Stratton (B&S) Small Engines This flat panel style, foam pre cleaner filter fits over the 491588S air filter cartridge and traps dirt, dust, and debris before they reach the main filter element, protecting the engine's air intake system. Designed for select Fits Briggs and Stratton (B&S) 3. 5 HP through 6. 5 HP Quantum series small engines commonly found in walk behind lawn mowers and