This would make a great movie! OK, I'm not a pro, but I think your thinking is right on target. Hold everything until you get one of the pros that hang around here to give you their professional take on this. You didn't say where you are, but I surmise you're in the Dominican Republic. Don't know how this Italian plumber got into the mix, but I can tell you from my experience the Italian plumbing code, if you can even call it a code, hasn't progressed much from the time of the Roman Empire. I don't have a inkling what the codes are in the DR, but my guess is they are not much. There should be some pros around here Monday morning.