How old is the toilet?
If a Jabsco manual toilet is more than 5 years old, you're prob'ly better off replacing the whole toilet than you'd be replacing ANY hardware that breaks.However, if just the handle broke, and the part with the threads is still screwed into the yoke, use pliars to unscrew that piece and order a new pump handle from Jabsco. Till it arrives, you can prob'ly cut off a section of broom handle to use as a pump handle...carefully. In fact, if you know anyone with the right tools to cut matching threads in the end of a broom handle, you can even make a new pump handle out of one.Btw...typing in all caps is the online equivilant of SHOUTING.