The Water Pump in your tumble dryer works by expelling air that passes over a condenser unit to this replacement pump that takes it into a tank which can then be emptied later. Over time, water pumps can break down and fail. If the Water Pump in your tumble dryer has stopped working properly, then you may hear or see the problems: a loud rumbling inside the machine or a failure of the water to drain out of the tub. Please Note: This replacement does not include the float switch. Please check the list of suitable models to ensure that this spare part will fit your appliance.