Inline heater that is integrated into the hose of the external aquarium filter, making a heater inside the aquarium unnecessary. Easy installation: cut the hose of the external filter that returns water to the aquarium, insert the external heater in between, plug it in, and set the desired water temperature. The integration into the filter circuit ensures a very even distribution of water temperature with an accuracy of ± 0.5 °C and a switching interval of 1.0 °C in the aquarium. LED display of the current and desired temperature. Replaceable, screw-on (3/4'') hose connections for 12/16, 16/22, and 19/25 mm including hose clamps. Total length 30.5 cm. Package contents: 1 inline heater 300 W for aquariums of 90-300 l (80-120 cm) with hose connections for 12/16, 16/22, and 19/25 mm and a cleaning brush.