I have to replace a very old slop sink in basement. It has 1 1/2" Galv pipe for drain, but it isn't vented. I am changing because my washer drains to it and has over flowed a few times,but always flows poorly. There is no clop in line,as I have snaked,but didn't help. I will be using solid PVC. If I tie drain to tee,and extend pipe 3 feet high,WILL THIS WORK? Thanks John :confused: