Built-in overflow for lateral glass boreholes, diam. 43 to 45 mm (1.69 to 1.77 in.), on the rear or lateral wall of the aquarium, with surface and bottom suction up to about 1,500 l/h (396 USgal./h). Water outlet diam. 40 mm (1.57 in.). For easy installation and quiet operation, we recommend the use of overflow hose set 1075/2. Fattar jag rätt? En borr mellan 43-45 mm ?