Good buy, assuming the tank is good.
Pto pump, they hang on the pto shaft and keep from spinning with a chain. Two hoses go back to the tank. Need a valve in it somewhere, multiposition type made for this work nice, can turn on or off 3 different parts of the boom, as well as controlling agitation.
Might want to look for a good cheaper used pump. You will spend a lot on a new one.