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.