AquaEuro USA 1/2HP Apex Titanium Aquarium Chiller. Dimensions 18 x 12.6 x 23.5 Inlet - 3/4" Outlet - 3/4" Flow Rate - 315 - 1,030 GPH Maintain optimum water temperature Digital LED temperature display control accurately maintains desired temperature Anti-Freeze System will not allow the heat exchanger to freeze Memory Recall will return the temperature back to temperature set before a power outage Corrosion resistant Titanium heat exchanger Powerful reliable compressor uses Dupont R134a ozone friendly cooling agent Automatic power surge shut off