I moved into my current home in 2007 and at the time I was told by the inspector that my kitchen sink needed a ptrap. Being that my wife and I were younger and excited to buy my first home I (and soon after welcome my son into the world) I absolutely paid no attention to his advice. I always assumed that a "ptrap" was some expensive mechanism that needed to be installed in a pipe under my house or something. Well over he last seven years my kitchen would smell horrible and more than a few times my wife and I would argue about who was responsible for the rancid garbage disposal. Where and how would I install a ptrap here. Must drains I see go into the back wall but this one goes straight down.