Hi this is the first posting. We purchased the old house last year and have doing some updating.

We asked the local company in chicago to replace the tub and add the shower room in the basement. It took almost three weeks to complete and we started to use since last week. We noticed that the odd smells come from the shower drain and found out that there is no ptrap there in the shower drain. They said that the toilet had ptrap so the shower drain is not installed any trap since toilet has the one. I do not know that they are certified plumber. Do you have any idea that we could solve this issue? We paid for $9000 for this project. Thank you so much for your help.