The Advanced Return 3/4" Locline Tank return is a unique return that is available with all Aquarium Life Support Systems Trickle Filters. The unique design allows a broad range of flow characteristics to be applied to any aquarium. Perfect for use in any system, its 3/4" Locline segments have many features including valves, check valves, extensions, flares, spray bars, and Y diverters. See all the great features available under the Locline fittings in the plumbing category.