This is Soxa-Marine Raw sea water pump Impeller and Oring Oil Lip Seals for Yanmar Marine Engine Raw Sea Cooling Water Pumps.

Replacement Yanmar Marine water pump impeller kit OEM Number 104211-42070, 104211-42071.
Fit Pumps 124070-42000, 124070-42001, 124070-42002, 128270-42000, 128270-42001, 128270-42002, 728270-42000, 728270-42001, 728270-42002.

The 104211-42070 Minor raw water pump impeller kit for pumps can be used for the Yanmar marine following engine models:
2GM, 3GM, 3GMD 1980-1983 year
2GM20, 3GM30, 1983-2005 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 1977-1980 year
SB8, SB12 , 1976-1980 year
SVE8, SVE12 1974-1976 year
YSB8, YSB12 1976-1977 year
YSE8, YSE12 1974-1976 year
YSM8, YSM12 1977-1980 year
NOTE:
The impeller kit used on a 6 bolt cover.
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.
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

Package Include:
Same as the picture shown
Water Pump Impeller with Pump End Cover Seals and Oil Seal.