Piston Ring Std / Briggs & Stratton 493261Pack Size:1Briggs & Stratton 493261ESF 163-086, Foley/Belsaw 597954, Foley/PLP 163-086, Laser 94399, NHC 266-9570, Oregon 36-026, Prime Line 7-03529, Rotary 8794, Sunbelt BR-66Briggs & Stratton 12A800-12V800, 121700-129800, 127800 and 129700Cylinder Diameter: 2.690 ", Ethanol: Not compatible with greater than 10% ethanol fuel