3.0 gallon (11.3 liter). Dual cap. Takes a pre-83 bajonet style vented & un-vented gas cap set and 22mm 75-up style 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 14-5/8″. 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.