3.0 gallon (11.3 liter). Single cap. Takes a pre-83 bajonet style vented gas cap 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 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. 52-78 XL (NU)