7.2.4.2.Sanitary T Fittings

(1) A double sanitary T fitting shall not be used to connect the fixture drains of two urinals where no cleanout fitting is
  provided above the connection.

  (2) No pipe fitting, joint or connection that would tend to intercept solids or reduce the flow through a pipe by more
  than 10 percent shall be used in a plumbing system.

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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.