Euro-Reef RS6-1 Protein Skimmer, 100 gal. capacity, 20 inch H by 8-1/2 inch by 10 inch. 6 inch diameter. Includes Sedra 3500 pump. Special features: Foam sponge helps reduce residual air bubbles. Easily adjustable riser pipe allows for accurate control of dry or wet foam production. Extra large collection cup eliminates the need for a drain. True union fitting for easy cup removal. No additional space above skimmer is required in order to remove the cup. The super quiet SEDRA pump is water cooled for maximum efficiency and its compact design allows for a seamless integration into the skimming system.