The Johnson Macerator pump grinds toilet waste, shredding it before it is pumped into or out from the holding tank. Macerators pumps utilize a high speed rotary cutter to shread waste efficiently. Brass shredder, nitrile impeller, and stainless steel shaft for corrosion and chemical resistance. Johnson pumps are designed to allow direct interchange with other macerators for easy installation. Empties a 30 gallon holding tank in about 3 minutes. Suitable for bowl or holding tank discharge.