Help setting up plumbing for new HE washer
I am redoing my plumbing for our new HE washer and the drain now is 1.5" also the same drain for the kitchen sink going approx. 10' to the main drain for the whole house which is a 6" black pipe with only a hole for a 1.5" line, My question is can I put a adapter in the 1.5" hole for 3" pvc and run the 3" approx 10' to the washer area and then down size it to a 2" line for the washer so it won't backwash?
http://i276.photobucket.com/albums/k...a/S4010748.jpg