You don't always get a old house, but when you do, you run into cast iron plumbing. With that comes old drain pipes, and other problems. One of which can be, rotted pipes, where they are just ready to fall apart. Or what I ran into, just a full pipe. With cast iron the inside gets rough, and everything starts to stick to the inside, and then it chocks the diameter down to like a quarter of the original size. You can see from the picture, it is a very small hole that is left. I cleaned it out as far as i could, but it is probably that full all the way down. 