50 Gallon Starfire Aquariums with Center Overflow 24x24x20" 10mm Starfire rimless Tank 24x24x20" 10mm 2/5" thickness Pre-Drilled Drain and return holes inside the overflow box 1" Drain Bulkhead and 1/2" return bulkhead are incldued. Return T Pipe (dual return) and Loc Lines, Durso Stand Pipe are included.