See more about this article : Master DOC skimmer up to 2113 UsG

Contains four Hydrofoamers Silence 9420.04, recommended for aquariums up to 8,000 litres (2,113 USgal.) of salt water.
Immersion depth from 160 to 370 mm (6.3 to 14.5 in), dimensions: L530 x B500 x W700mm (L20.8 x W19.7 x H27.6 in.), 230V/50Hz (115V/60Hz) 64 W, water throughput: 5,200 l/h (1,373 USgal./h), air capacity: 3,400 l/h (898 USgal./h), Skimmer cup volume: 7 litres (1.8 USgal.).