Just FYI, but I have used a PVC electrical fitting (they are not tapered thread), an O-ring, and a plastic conduit nut if you don't have a threaded hole (you will have to sand the end down so it won't bottom out) to get through odd spots before. I don't remember the exact fitting I used, but a little sanding on the inside and I was able to pass a PVC pipe thru it and cement it in place. I was using it as the base for a bell syphon, but it would work horizontally.