by now you may have already solved your problem, but if no, try this remove the plug, clean the mating surfaces on the pipe and the plug, reduce the diameter of the plug by unscrewing the the screws, using a polyurethane caulk coat the rubber seal thickly then reinstall the plug and re-expand the plug to its tightest fit, then hope that it doesn't rain until the caulk sets
Good luck
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