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.