John, The only thing I can think of is to either lower the water below the pipe or 'take the dive' and plug the MD. I've experienced similar situations in the past and have yet to come up with another way to do it. It may be possible to temporarilly cover the drain with a sheet of vynal, etc. to slow the water down and use some 'blue' wet/ dry quick set pvc glue to make the final connection (plumb the line backwards from the pump and make the 'wet' connection the last one). Sorry, but that's the best I can come up with, though I'll let it percolate in the brainpan and ask my co-workers.