Need utility sink drain help
I think you need to provide more pictures. Show us the main waste stack/soil pipe - especially where it exits the building, and both ends of that horizontal line. I'd also like to see the "sump". Something about your descriptions doesn't make sense. If the horizontal PVC is a sump pump discharge, why is there a tee on it? And if that vertical pipe (the portion below the tee serving the washing machine vent) is a vent, what does it serve? A floor drain?
Just as an aside, I'd recommend cutting the washing machine standpipe about 6" below it's horizontal vent pipe. If that drain line ever became clogged, water would spill down through the vent(s) before overflowing the standpipe.
Last edited by Ishmael; 01-04-2013 at 07:12 PM.