I started to get a smell in the downstairs bathroom and after ruling out the wax seal on the toilet it is coming from the sink drain. We are in a split level so technically its in the basement.
Strangely there is no P-Trap, just a drain that goes into the wall and I assume straight into the sewer line as the drain doesn't come out on the other side (a garage is on the other side of the wall).
Is there a reason for not having a trap?
The main question: How do I install one. I am quite handy and have no problems working with PVC but wanted to get advice on how I disconnect the copper (is it copper?) drain and what I would use to go Copper -->PVC (links to home depot welcome!).
I am assuming i use a blowtorch to melt any solder but want to check first as I don't usually work with copper. If it was a pressurized line I would call a plumber but I'm confident with guidance I can add the trap.