In this video, I am replacing a floor trap in a basement. The floor trap is part of the drain assembly of a basement drain. This trap is a standard three inch p trap. If you smell sewer gas in your basement, it could be a sign of a failing or failed p trap. In order to cut a hole in the basement floor, I used a Bosch DB741C diamond blade (https://amzn.to/2LDIenx). This worked extremely well and allowed me to break the concrete with a sledge hammer. Under my floor was terra cotta clay. This could be cut with a carbide grit sawzall blade from Freud (https://amzn.to/2PMjlUV). The p trap was glued with purple primer and pvc glue, then attached with a fernco style rubber connecter. These are a great way to connect a pvc pipe to an old clay pipe. This will save a lot of money if you are relatively handy.