This 3" Classic look aluminium fuel filler cap combines the quick release function of an Aston cap with the smooth lines of the Monza. It includes a lockable insert (supplied with 2 keys) and has an integral neck to allow a 2 inch bore hose to be attached.Dimensions - 100mm Diameter x 131mm LengthPlease note these caps are non-venting so it may be necessary to add a separate vent to the fuel tank.