Hi. We are in the midst of a very small powder room renovation, and we are struggling a bit with the p-trap plumbing for the new wall-mounted sink. There was a wall-mounted sink previously, and the p-trap went low and made a left 90 degree turn into the vent/drain pipe. Since we are trying to clean up some of the piping and minimize it, we'd like to move the p-trap up higher on the drainpipe. Ideally, we'd like to have the p-trap turned and just go straight into the drainpipe instead of having an extra 90-degree turn. However, we have PVC going to a galvanized pipe, which I believe is threaded. The galvanized pipe is a vent for other things, but it does not seem to be a drain for any fixtures above the powder room - only a vent. Is it possible to take out the existing santee, cut the galvanized pipe, and then move the santee higher up and still connect the PVC to the cut galvanized pipe without threads? Can we use a proflex neoprene shielded coupling in the wall or something else? Any thoughts would be greatly appreciated! Also, my notes on the drawing for where we want to move the p-trap is not exact. Hopefully it gives an idea though!