THIS RING SET IS FOR ONE PISTON DESIGNED TO FIT ONAN ENGINES WITH 3 1/4" .010" OVERSIZE BORE THAT USE ONAN PART NUMBER 113-0310-10 RING SET. THIS HAS A .058 TOP RING. THAT IS MOST OF YOUR B43 B48 AND LOTS OF YOUR P216, P218, P220 MODELS THAT HAVE NEW PISTONS. PLEASE CHECK YOUR PART NUMBER BEFORE ORDERING . THESE ARE DESIGNED FOR EXTRA OIL CONTROL IN USED CYLINDER AND WILL FIT YOUR OEM PISTONS .THE RINGS MEASURE: TOP: .058" 1/16" OR 1.5MM SECOND: .058" 1/16" OR 1.5MM OIL RING: .125" 1/8" OR 3.0MM
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