12v Macerator Sanitation Water Pump 45 LPM 12 GPM RV Marine Boat Waste DC Toilet 12V HEAVY DUTY MACERATOR PUMP 4 blade choppers reduce clogging 12GPM flow rate will empty a 30 gallon holding tank in 3 minutes Inlet 1 1/2"- Discharge 1" New Anti-Clogging Feature. Dislodge Clogs Without Removing Hoses!