Continue to keep your outdoor power equipment running at prime performance and prevent the cost of repairs by ordering genuine Briggs & Stratton replacement parts. This Briggs & Stratton Foam Element Air Filter can be used on 450-550 E and EX engines. It is a direct replacement for original service part number 799579. For the best fit make sure you have your old filter handy to compare size. Keep your machine performing properly by changing your air filter when soiled. This filter helps keep your engine at EPA regulations standards.