Tetra Whisper 40 Aquarium Air Pump If you're like most home aquarium owners, quiet aquarium equipment is important to you. The goal of the innovative design of Tetra Whisper air pumps is ultimate operating silence without loss of efficiency. The unique patented dome shape actually flattens sound waves, while thick walls, noise dampening chambers, wide rubber feet and a suspended pump motor make the Whisper air pump among the quietest on the market. All this while the pump's diaphragm produces the considerable air flow needed to drive sponge, undergravel and internal filters, protein skimmers and action ornaments. Specifications: * Model: 40 * Watts: 2.9W * Dimensions: .5" x 6" x 2.75" high * Outlet: 1 * Recommended Tank Size: 40 gal.