7.2.10.5.Saddle Hubs

(1) Except as provided in Sentence (2), a saddle hub or fitting shall not be installed in drainage, venting or water
  systems. (See Note A-7.2.10.5.(1))

  (2) A saddle hub or saddle clamp may be installed in a building drain or building sewer of nominal diameter not less
  than 8 in. and that is in service provided that the connecting branch is at least two pipe sizes smaller than the run of the
  building drain or building sewer to which it is connected.

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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.