Hello

I have an older home. The previous owners replaced a wall hung sink (in a 40's style art deco bathroom) with a silly short vanity. I'd like to return it to it's former glory with a wall hung sink. The waste line is PVC, and goes through the floor into the basement (the entire cast iron waste line has been replaced with PVC.

What I have now is a 1 1/4 " PVC S-trap with a transition coupling to 1 1/2" PVC above the floor. I am unsure of where I should transition from brass to PVC. Do I run the brass 1 1/4" line entirely through the floor and then cut a segment of PVC out before it enters the main line, and use a coupling that increases to 1/1/2 inch there? Or do I have to maintain the 1 1/2" coupling above the floor with the coupling showing?

Thanks for any help
Karl

What I have now is a 1 1/4 " PVC S-trap with a transition coupling to 1 1/2" PVC above the floor. I am unsure of where I should transition from brass to PVC. Do I run the brass 1 1/4" line entirely through the floor and then cut a segment of PVC out before it enters the main line, and use a coupling that increases to 1/1/2 inch there? Or do I have to maintain the 1 1/2" coupling above the floor with the coupling showing?
Of course you realize that "S" traps are outlawed in the US and Canada.
Having said that I'll answer your question. This is simply a question of what will look the best and in my opinion extending the metal tailpiece below the floor line and covered with a escutcheon plate will give you a cleaner, neater looking installation. Good luck, Tom

Thank you for the response

-- No, I did not know that s-traps are illegal, it makes me wonder why I even bothered with a home inspection prior to buying the place. It would be painfully obvious to anybody who saw it that the "goings on" under the bathroom sink was not original to the house, and no more than a few months old. Will this give me problems then (The s-trap works fine now).. Is it necessary to solder a (? Male or female) to the brass, and then screw it into the PVC or can I just line them up and use the coupling?. thank you!

By "coupling" I hope you mean a compression fitting,(see image). You will take and prime and glue a 1 1/2" PVC compression fitting on to the 1 1/2" PVC pipe under the floor line. You will place a 1 1/2" X 1 1/4" Nylon washer in the compression fitting to convert from 1 1/2 to 1 1/4". That's all there is to it. Good luck, Tom