Tunze DOC 9004 Nano Protein Skimmer. Specifications: * Recommended, depending on tank load, from 60 to 250 litres (15 to 65 USgal.) of sea water. * Immersion depth: approx. 225mm to 245mm (8.86 to 9.65 in.) * skimmer cup volume: 0.2L (.52 in.) * air output: approx. 150l/h (40 US gal./h), 4W, 230V/50Hz (115V/60Hz) * dimensions: L 110 x W 90 x H 305mm (L 4.3 x W 3.5 x H 12 in.) * fixed by means of Magnet Holder up to a pane thickness of 12mm (0.47 in.).