quote; 1. Is a 4" clean out required? Will the 2 1/2" one on the side of the house serve the purpose? 2. If i need a 4" clean out access, does the clean out have to be in line with the main drain? Can I use the drain line for the outdoor kitchen as the clean out? 3. If I need to have the clean out on the main line, can I just have it added at the end of the patio slab (about 15 ft from the house) or do I have to break out a hole in the new slab and add the clean out back in? 1. this is an easy one to answer. NO! 2. You can put it anywhere it will access into the main line and the kitchen drain is NOT adequate 3. A good plumber will install "2 way cleanouts" so the line can be accessed in either direction so it can be anywhere in the main line. 4. I just had a customer who had to pay a lot of money to find and elevate his cleanouts because the landscapers buried them. Who is screwing with the site and editing to make the responses a single "run on" paragraph?