When it comes to S traps, the term Correctly connected could be an oxymoron. But since you need to use it, the short side of the J bend connects to the S pipe, and the sink drain tailpiece goes into the long neck of the trap.: I am having trouble hooking up a new laundry tub using a 1 1/2 S-Trap. I would very much appreciate it if someone here could direct me to a site that would have an exploded view of a correctly connected S-trap. Please send a response to [email protected] since I am not sure I can navigate back to this site.Thanks.