Raritan Macerator Pump - 12v w/Barb AdapterMacerator Pump 12v w Barb Adapter Macerator pumps are the key to a number of important chores on a boat! The most important is to work when it is needed. While macerator pumps are generally used to empty holding tanks they can also be used to empty fish boxes. Raritan had two goals in mind when it set out to design a better macerator. The first is the run dry time because as most owners know when you flip the switch to begin emptying the tank you dont