I had a leak coming from the condensate pipe coming from the boiler. I put all new pipes in and cured that leak. However now I have a leak coming from where the black seal is. I had to remove and then put it back in when I replaced the rest of the pipes. Is there any reason now this would leak even though it was perfectly fine until I messed with it. Could the new plastic white pipe that I put into the black seal be to short. Any help would be appreciated.