Einhell dirt water pumps einhell 41 704 71 p the b einhell b gh dp 3730 dirty water pump is a robust powerful and very reliable helper for emptying rain barrels pools wells and much more besides with a rating of 370 w the pump achieves a delivery rate of up to 9 000 liters of dirty water per hour an infinitely variable float switch can be used to set this robust pump to continuous operation or to a specific on and off switching level the high grade mechanical seal of the gh dp 3730