Briggs & Stratton Part Number 491588S. Review the part description and image diagrams to ensure the part is a suitable replacement. < span class="a-list-item" >This air Cartridge (flat) air filter made of pleated paper provides excellent protection from the destructive effects of dirt ingestion. Used on some Quantum engines, 625-675 series engines and 625e, 675e, 725e and many other engines. These Briggs & Stratton 491588S parts are for reference only. Review the part description and image diagrams to ensure the part is a suitable replacement. Original Stratton guarantees the right fit and performance to extend the life of your Briggs & Stratton. Please check compatibility before ordering. For product information, refer to your engine owner's manual or parts list. These documents are available on the Briggs & Stratton website