3.0 gallon (11.4 liter). Dual cap. Takes pre-83 bajonet style vented gas cap and 3/8 NPT pre-75 style petcock. Approx. dimensions: Tank length 16?”; tank width 12″; tank depth 7″; tunnel length 16″; tunnel depth 2?”; tunnel width 3?”; hole to hole on mount bracket 18″. 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.