Cylinder head gasket for BRIGGS STRATTON lawn mower tractor engine Models: INTEK AVS 11,5 HP INTEK AVS 13,5 HP 21A900 21B900 etc. INTEK OHV 15 HP 15,5 HP 28N700 28Q700 etc. Part No.: 320238 Original part number: 273280S - 273280 AS