Flow: 3,500 – 7,500 GPH (13,000-28,000 LPH) Wattage: 10 – 60 watts Maximum Tank Thickness: 1″ (range 3/8″ – 1″) 26mm (range 9.5mm – 26mm) Appropriate Tank Size Range: 120 to 1000+ gallons (450 to 3,800+ Liters) Dimensions: Wet Side- 4″ diameter by 3” long. (102mm diameter by 76mm long.) Dry Side – 4″ diameter by 2.8″ long. (102mm diameter by 71mm long.) Clearance Needed Behind Aquarium: 3.3″ (84mm)