2.2 gallon (8.3 liter). Single cap. Takes pre-83 style vented gas cap and 22mm 75-up style petcock. Approx. dimensions: Tank length 16½”, tank width 9″, tank depth 7″, tunnel length 16, tunnel depth 2¼”, tunnel width 2½”, hole to hole on mount bracket 17½”. 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.