Replacement Balmar AltMount J-10 40″ serpentine belt for your AltMount pulley and belt kit. Contains one (1) J-10 Belt 40″ long.
It is a good idea to keep spare serpentine belts in your spares reserve. They don’t take up much space, and can help you get to safe harbor if you have a failure.
Yanmar 3YM30 Kit