The Drain Pump is an OEM replacement part for Whirlpool washing machines. It is responsible for removing water from the washer tub at the end of each cycle. This pump works to circulate and expel excess water, allowing for proper drainage and effective cleaning. Causes of a bad drain pump can include clogs or blockages in the pump or its housing, wear and tear on the pump motor or impeller, or electrical issues preventing the pump from functioning.