[modeleng] Rubber Seal

I am getting on with Topsy, but I have hit a minor snag=2E

The petrol tank for Topsy has a sight glass held in place by a single thum=
b
screw and seals to the tank using a rubber seal=2E

Therin lies the problem!  Over the years, the seal has dried out and is no=
w
brittle and hard as thus no longer seals=2E

I need to replace it, but what with=3F  Would a rubber washer from a garde=
n
tap fitting do, or is the rubber in petrol fittings a particular compound
that is petrol resistant=3F

Is there another material I could use=3F

Cheers

Peter=20

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