BSea-Doo (139.5 MM) Wear Ring SP GT XP GTS GTX Explorer SPI SPX Speedster HX GSX GTI Challenger GS Sportster 271000290 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 ReviewbP PP Sea-Doo (139.5 MM) Wear Ring SP GT XP GTS GTX Explorer SPI SPX Speedster HX GSX GTI Challenger GS Sportster 271000290 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 PThe SBT wear ring performs better and is more economical, which allows you to replace the wear ring every time you are doing work on the jet pump.