3.0 gallon (11.3 liter). Single cap. Takes a pre-83 bajonet style vented gas cap and pre-75 3/8 NPT petcock. Approx. dimensions: Tank length 16«"; tank width 12"; tank depth 7"; tunnel length 16«"; tunnel depth 2¬"; tunnel width 2¬"; hole to hole on mount bracket 16-9/16". 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.