My daughter has recently had her downstairs toilet panelled by a joiner.They previously had a boxed in stop tap next to the wc and to try and make it a neat job he has fully boxed in behind the wc with an access panel for the stop tap. The problem is the existing 90 degree pan connector finishes just inside the boxing and is too far away to get the wc back on to it. So I need a new straight wc connector from the toilet but how do I connect this into the 90 degree pan connector that is already there as the pipe end of the new straight connector seems to be too small to create a good seal.