Hi Adrian Just checked my 91GT and 94GTS and neither appear to have a seal in the cap but both have a rubber seal over the filler neck so the red cap sits over this when you screw it into place. Regards Andrew Sent from my iPhone > On 25 Sep 2018, at 11:26, Adrian Clark via 928uk <928uk at lists.928.org.uk> wrote: > > <mime-attachment>