Welcome to the forum Dave! Yes, it should be tight. Can you tell if the overflow elbow is in the pond bottom or suspended ? To use any type of sealer you have to go swimming in the pond, or pull up the vertical overflow pipe out of the elbow to let it drain down so the elbow is at the water surface.
Thanks esshup. I will have to check it again and see where the elbow sits. I think the vertical pipe will pull out but need to check it as well. It will probably be next week before I physically get up there again. If the vertical pipe pulls out what sort of sealant should I use?
