The einhell gh dp 3730 dirty water pump is a powerful and robust machine for emptying garden ponds flooded basements and construction sites and will take particles of up to 30mm in diameter the pump is equipped with a float switch for automatic onoff operation for a varying water level it is made from high quality materials and has a durable construction for maintenance free operation the pump has a universal connection for 25mm 1in and 32mm 114in male thread hose connections as well as a 1in ma