Piston Ring Std / Briggs & Stratton 499996Pack Size:1Briggs & Stratton 391780, Briggs & Stratton 394665, Briggs & Stratton 394959, Briggs & Stratton 499996ESF 163-077, Foley/Belsaw 5976209, Foley/PLP 163-077, Green Meadow RO77, J. Thomas 394959, Laser L5612, Laser 94207, NHC 266-9202, Oregon 36-005, Prime Line 7-03748, Prime Line 7-03553, Prime Line 7-03525, Ratio Parts 3-155, Rotary 1466, Sunbelt SB-1466, Sunbelt B1SB1466Briggs & Stratton 220400-222400, 252400-257400, 28A700-28D700, 280700-286700, 400400, 402400-404700 and 42A700-460700Cylinder Diameter: 3.4375 ", Ethanol: Not compatible with greater than 10% ethanol fuel