2.2 gallon (8.3 liter). Single cap. Takes pre-83 style vented gas cap and dual 1/4" threaded for aftermarket petcocks. Approx. dimensions: Tank length 16«"; tank width 9"; tank depth 7"; tunnel length 16; tunnel depth 2¬"; tunnel width 2«"; hole to hole on mount bracket 17«". 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.