The new EHEIM Compact Pump series for use under water is available with three different outputs. They are suitable for use in aquariums, keeping and rearing tanks where reliable water circulation or flow is required. The flow rate can be adjusted by the slidable output regulator as required. Thanks to the small dimensions the immersion pumps can be installed in the smallest of spaces; they are easily attached by suction holders to the inside panel of the tank. Pump Output: 160 gph. Max Head: 4.3 ft. Dimensions: 2.5" x 1.8" x 3.3". 3 year manufacturer's warranty. Pump Output: 265 gph. Max Head: 6.6 ft. Dimensions: 3.0" x 2.1" x 3.7" . 3 year manufacturer's warranty.