Impeller and gasket Kit This fits a 6 bolt cover with a 2-1/4" (58mm) diameter. This will not fit Closed Cooling ( antifreeze ) Models If your model has fresh water cooling (antifreeze) add F to the end of your model number. Replaces: Impeller Numbers 104211-42070 , 104211-42071 , Sierra 18-8952 Gasket 104211-42090 104211-42070 water pump impeller (has drive pin that fits slotted shaft) fits all YS series, all Japanese built raw water cooled 2/3GM's, 2GM20's, 3GM30's up to 1996 & 2QM15. Fits Yanmar: 2GM , 3GM , 3GMD , 1980-83 2GM20 , 3GM30, 83-05 raw water cooled (no antifreeze), made in Japan. Will not fit 1997 and later European made. ( the serial number will start with E on the European models) 2QM15 , 1977-80 SB8 , SB12 , 1976-80 SVE8, SVE12, 1974-76 YSB8 , YSB12 , 1976-77 YSE8 , YSE12 , 1974-76 YSM8 , YSM12 , 1977-80 Pump numbers: 128270-42000 , 128270-42002 Diameter: 40mm (1.58") Width: 19mm (3/4") Shaft: 9.5mm (3/8") 6 Blades