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Wine or beer brewing kits have big rubber bungs and you can get them from suppliers of kits and home brewing equipment.
I've just read how they used beer brewing bungs on the Black Buck Vulcans to seal the pressurised bulkheads where they had run extra cables through from pylon mounted radar jammers, borrowed from Tornadoes... They had to build the pylons too, but that's another story,,,What a brilliant story though... Read "Vulcan 607"
Just put a little air in it and plunge it into the bath, like a bicycle inner tube..
Another good leak tester is clutch and brake cleaner.
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