Well its on to the next project. as you may remember we have purchased an older home. as such i have a cast iron deep sink in the basement that my washer drains into. in addition i have put in a dishwasher (had to run all the plumbing to it as there was nothing where we had to put it (opposite wall from the sink). that was easy. i ran a pvc drain across to also drain in the deep sink. i have 2 drain lines that drop down into the slab which obviously runs to the sewer. my kitchen sink runs into one of them. i assume one is a vent and one is a drain? i want to cut the pipe and put in a pvc fitting and pipe that runs along the back of my sink and tie in my washer and dish washer so that they run direct into the sewer drain. is this a good idea or should i leave it as is?