Water pump mechanical seal.
It will suit NSR250 MC16 & MC18 models.
Will also suit :
NS50 1990
NSR50 1993 - 2004
NSR75 1992 - 2000
NSR150 SP models
CR80 1983
CR125 1981- 1983
CR250 1981 - 1984
ATC250 1985 - 1987
CX500 1982
CH250 1986 - 1989
NES125 2003 - 2006
SH150 2008 - 2009
CRM50 1992 - 1996
CRM75 1990 - 1994
MTZ125 1983 - 1990