3.3 gallon (12.5 liters). For 22mm petcock (not included). Takes 96-up screw-in style gas cap (not included). Approx. measurements tank mounts (center line to center line) 58.5cm, length of the tank 47.5cm, total height 21cm, Total width (widest point) 27cm. Note: It is advised to pressure test, seal and test fit all tanks before tanks are painted and installed. Some tanks are painted, but this coat is applied for rust prevention during storage only.