When I saw Warren's pic, gas pipe repair 'tape' came to my mind too...
What about a rubber sewer pipe connector with clamps (as suggested above)-- and pick up a tube of 3M 5200 Marine sealant--- split the connector down the middle, goop everything with the 5200 and cinch up the clamps...
In fact, every boater I know says to DO NOT USE 5200 if you ever expect to remove it! You could probably just goop some of it around that hole and be done