I am bidding a commercial plumbing job in Massachusetts. The building is one story and on a slab. I will be installing five bathrooms in this pizza place/pub. I am seeking opinions on whether to install 4" service weight or no hub cast iron for the drains. Someone told me the Massachusetts plumbing code requires service weight, but I cannot find that in the code book. No hub would cost less. Any comments & suggestions would be welcomed. Their will be about 60ft of buried cast iron.
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No Hub or Service Weight?