Removes coatings and foreign particles from the water surface: accessory for external filter - skimmer for aquariums 60 – 600 litres (from 35 cm height upwards) Place skimmer in the aquarium, connect to suction hose of the external filter (replaces existing suction pipe), regulate surface water/deep water suction with adjustment spindle Universal: for hoses of 9/12 to 16/22 mm diameter. Infinitely adjustable suction capacity: surface water and deep water suction. Semi-circular shape for corner attachment 2nd generation: optimised floating body – more buoyancy and adaption to the water level, stronger comb, removable adjustment spindle Package contents: surface skimmer Top Clean II