2.9 gallon (11 liter). Takes a 83-up screw type gas cap and a 22mm threaded petcock. Old School with capital letters in a Sportster design. Complete with a extra low tunnel that is just 1-1/4" deep and a flat bottom to sit high on the frame for the classic Frisco style. Approx. dimensions: 16" tank length; 11" tank width; 8" tank depth; 16" tunnel length; 1¼" tunnel depth; 2¼" tunnel width; Mount hole to hole 16-5/8". 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.