This is the Dry version of the bestselling Oase Aquamax pond pump. It is specially designed for dry installation. ie, it is not submersible but joins up straight to your pipework. It is perfect for a gravity-fed system favoured by koi keepers. The pump is designed to be installed and operated below the water level of your pond and housed in it\'s own wet chamber where it pumps back into the pond. This pump requires little maintenance and is extremely quiet in operation