O-ring for the impeller pump used on Yanmar YM series marine diesel engines. This seal is used during water pump service or repair and replaces part number X02173476. Compatibility Suitable for Yanmar YM series engines. 2YM15 14PK, 3YM20 21PK, 3YM30 29PK, 3YM30AE 29PK Series YM series Part number X02173476