This one piece tank is perfect for a variety of custom applications. It has rounded mounting plates front and rear that are welded in place. It features a twin cap look, but the left neck is non-functional, for appearance only. The 3.3 gallon capacity tank fills on the right-side only. Tunnel measures 2 1/2"-high x 2 3/4"-wide. Tank measures 18 1/2"-long x 12"-wide.