Tunze Nano DOC Protein Skimmer 9002 Recommended for aquariums from 40 to 200 liters (10 to 52 gal) of salt wate Dimensions: 4.9" L x 2.1" W x 13.3" Immersion depth: approximately 7" to 8.6 Skimmer cup volume: 0.3 l (0.79 gal Air capacity: 150 l/h (39.6 gal/h