RV Macerator Pump for Sewage, 12V RV Portable Waste Chopper Pump for Camper Trailer Boat, 12GPM Suction 10 Feet Lift, 30s Run Dry Protection. Simple operation and functional for trailers: you won't feel troubled when clean the sewer hose if you make the switch to incorporate this pump, the waste pump empties a 40 gallon holding tank in less than 5 minutes, but you should notice that it can't handle hard objects, sanitary napkins or rags.
eBay