Can a saddle tee legally be used to tie shower drain into 4 inch main drain in the state of Illinois? All plumbing is PVC.

  • Generally speaking they're prohibited inside buildings. You'd use a pair of shielded couplings and standard sanitary tee. I'm not familiar with Illinois and any deviation from common code, though.
    – isherwood
    Feb 3, 2020 at 15:17


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