StayCoolPumps Impeller Kit Replaces Yanmar 104211-42071 New Impeller Kit includes new impeller and gasket. This fits a 6 bolt cover with a 2-1/4" (58mm) diameter. Replaces Yanmar Marine Diesel : Impeller 104211-42070 , 104211-42071 , Sierra 18-8952 , Gasket 104211-42090 Fits Pump numbers: 128270-42000 , 128270-42002 Fits Yanmar: 2QM15, SB8, SB12, SVE8, SVE12, YSB8, YSB12, YSE8, YSE12, YSM8, YSM12 and some GM models 104211-42070 water pump impeller (has drive pin that fits slotted shaft) fits all YS series