ASM G-1X Protein skimmer, All Seas Marine G-X1 Series protein skimmer use needle wheel technology to produce extremely fine bubbles that results in extremely effecient skimming of your aquarium. 5 1/2" Diameter. 22 1/2" Height. 8 1/2" x 11" footprint. sedra 3500 pump included. Rated to 150 gallons.