The model 4000 series expansive design will meet todays increased market demand for performance on all levels. This series is a perfect blend of medium pressure and ample flow for the majority of ponds. Motor is totally enclosed, fan-cooled for durability. These External end-suction centrifugal pumps are ideal for water features, garden ponds, and Koi fish ponds. These sequence pumps can serve a wide variety of water transfer and re-circulation applications. They are designed to operate efficiently over a wide range of flows and pressures. In larger systems, you can use two or more Sequence pumps in parallel to multiply your flow. These external pumps can be installed near areas of relaxation and entertainment and will generate minimal noise levels. These pumps longevity is legendary.