All Glass Aquarium AAG12304 Overflow System, 75-Gallon

The Mega Flow Overflow System by All-Glass Aquarium is engineered to allow maximum water flow to the main filter system, while greatly reducing cascading water sound. The Mega Flow Overflow System design draws water from the surface, mid-range and bottom levels of your aquarium. This provides more effective circulation and filtration, which helps eliminate dead water zones in your aquarium, significantly out-performing the competition with a maximum flow through rate of 600 G.P.H. per overflow.