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Trap on 4" sewer main in basement
So I had a sewer back up the other day and decided this was beyond my abilities (and equipment) as a homeowner. My wife's brother is a plumber so we called him in to help. Long story short I got to see my sewer pipe on TV and we are now running clear and have a clean bill of health. Anyway he is a plumber in Maryland and I live in Pennsylvania and I had something in my basement he says he has never seen. About 2-3' before my drain leaves the house I have a trap (with cleanout and it's fine). Now I don't know if this is still code or what the deal is, but he says in Maryland there MIGHT be something like that outside the house, but he has never seen anything like it inside the house. My house is over 100 years old and this is all cast iron fittings so it's very old. Does anyone know anything about this type of setup? Does the trap really need to be there? I have a small section of cast iron pipe that comes out of this trap that needs replaced. He is suggesting I eliminate the trap as part of this replacement. I figured I would throw it on here because of all the great information I have gotten already. Would it be worth it to just call the town office and ask them? Just want to figure out my path going forward any help is appreciated thanks!