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Thanks. Will do after the project.

Yes, I should have put in the necessary planes or drawn it differently but did not know what is the standard way. I will read up on how plumbing drawings should be drawn so that I could correct it in the future. Your question: "So tell me if I have this correct: The existing 4" line is below...

Thanks for your suggestion. I'll follow you advise in the future and read up on how plumbing drawings are drawn so that I can do better.

Yes, saw that in the code. Thanks. Here is my sketch of your suggestion. Please let me know if it is ok. If yes, can I modify it by removing the 4" cleanout tee, put the 4x2" reducer where the tee was, add a 2" cleanout tee, transition to the double fixture fitting. I'm trying to not make the...

Yes, you are right. NYC code is different from NYS code. I called up the city and they pointed me to the code in current use "2014 Construction Code" which includes the plumbing code. Also, code section 702.2 states that "Underground building sanitary drainage and vent pipe. Underground building...

Wayne, Thanks for responding. If I am reading the code incorrectly, my apologies. I checked the NYS code https://dos.ny.gov/system/files/documents/2020/09/2020-pcnys-november-2019.pdf. Section 703.2 states "Drainage pipe in filled ground. Where a building sewer or building drain is installed...

Thanks Wayne. Yes, NYC allows PVC for sewer line. I will implement your solution for the clean out as long as I have enough space between the wye and the foundation wall.

Jeff, Thanks for responding to my post. So are you saying that for option 2, instead of using a 4in cap, use a 45 and add a clean out. If yes, can I extent the 45 with pipe to bring it up to a height that is accessible and then add the clean out. I plan on covering the sewer pipe and wye with...

I am a newbie and am doing a modification to a sewer line and would be grateful for some expert advise. I have a cast iron 4in sewer line that has a 2in cast iron elbow to which a 2in kitchen sink drain pipe was attached. The elbow is connected to some type of reducer in the sewer line. The...