Problem. The plumbing drain is leaking. The house is 20 years old, and the plumbing is metal here. The configuration is as follows: Double sink joined under the sink emptying into a single outgoing drain. In addition, input dishwasher is connected to the waste stream of one of the drainage pipes. How difficult a job is replacing the entire pipe from the sink drain into a drain output (no leaks here)? Can I use plastic instead of metal? If you can use plastic, it is practical to do it myself (with good advice, I can do almost anything, such as changing the brakes on my car)? Are there any articles on how to do this? If I send a plummer, how much $ can I expect to replace the drain pipe from the kitchen. From what I can tell … Go to your local Home Depot (or equivalent) and ask one of the guys customer service in the plumbing section. He should be able to give you step by step instructions. Sometimes even little instruction sheets have been printed. I do not know how much you would charge a plumber. A whole lot more than doing it yourself, guarantees. I live in a house that is over 50 years old. Last year I got in valves for my bathroom sink did not have before. They never leaked, and all they had were those instructions CSR.