Briggs & Stratton pre-filter fits: 3 and 5 HP horizontal engines 130200 series starting at type number 2915. Fits all 3.5 thru 6 HP Quantum engines. Size: 4-7/8" L x 4-1/4" W x 5/16" H. Use with our P/N 30-710 main air filter. Replaces OEM part numbers 491435, 491435S, and 271933.