charmille 4020.1 m2 fill tank pump

does any one know the specs for the fill tank pump on my charmille (1994). i would like to replace the pump but C.T. wants $5,000.00+ for a new one.
if i can get the specs maybe i can get a equvilent sump pump from pump manufacter. i pulled the pump but do not see any label on it, of course its been submerged for almost 20 years.lol
any help would be appreciated.
i did call charmille and they were no help.