It's a very old
Jabsco, possibly even old enough to be a "Par Jabsco." A new Twist 'n' Lock
pump assembly should bolt right onto the base.
It also appears to need a new seat and lid. By the time you buy that AND a new pump assemblly, it might make sense to replace the whole
toilet. This is a good time to find it on
sale.
Peggie
--Albert Einstein
"If you can't explain it to a six year old, you don't completely understand it yourself."