I recently purchased a home that has a shower with no drain trap. The home is built on a concrete slab. I plan to gut and replace the shower (and break concrete/re-work plumbing) eventually. However, I am curious if there is some sort of mechanical trap that could be used in the short-term?
I am thinking something that could just be temporarily placed inside the 2" drain pipe (like this for repairing toilet flanges). I am just trying to prevent the nasty smell/gasses that are coming up it (although it is just tied into a grey water line, not sewer). We are hoping to continue using the shower even in the short-term before we can get it fixed correctly with a P-Trap.