I have a new bathtub installed, and I am trying to connect the plumbing underneath. The current setup is a copper 1.5" ptrap with some threading on the end.

I went to Lowes, and found a PVC fitting that would screw into that. I just want to know if I screw it in and done, or if I need to apply an o-ring or glue or something to get it going.

Thanks for the help!