What is wrong with our bathroom sink drain? Can we fix it?
There has been a somewhat sewage-y smell in our bathroom since we moved into our apartment a month and a bit ago. It comes and goes, but today we decided to try and figure out exactly what the problem was. After trying to clean under the shower and sink, we saw the following:
The white hose coming out of the trap (first photo) runs down into a pipe in the floor, but it doesn't really seem to have anything that seals it: you can slide that pipe in and out without any real resistance, and you can completely remove it (and we cleaned it out thoroughly).
It seems like there should be something that seals the pipe to base, but we don't know what piece goes there.
What is the name of the thing that we put there to seal these things together? Assuming that is a thing that is missing, we are hoping to avoid having to call a plumber and do this ourselves.