I have a contractor moving the plumbing from one wall to another in our laundry room so we can build a laundry closet for our new stackable washer/dryer. When I inspected the plumbing I noticed some things I hadn't ever seen before and wanted to make sure they would work. First of all, the drain (which will serve both the washer (standpipe) and a sink next to it) contains a p-trap below floor level a few feet from the standpipe - This will be the only ptrap for the washer standpipe and will also serve as the ptrap for the sink (altough the sink may have another trap under the cabinent). I've never seen a p-trap this far from a fixture before - is this OK? My other question is in regards to the vent - a vent was installed after the before mentioned p-trap (as a vertical branch off the drain by the sink). I've never heard of a vent being installed after a p-trap. Is this work ok? There is another vent for the bathroom 7 feet away so do I even need a vent here? Thanks, Trevor