7.3.3.4.Unions and Slip Joints (See Note A-7.2.3.1.(1) and (3))

(1) Except as provided in Sentence 7.4.6.3.(6), running thread and packing nut connections and unions with a gasket
  seal shall not be used downstream of a trap weir in a drainage system or in a venting system.

  (2) Slip joints shall not be used
  (a) in a venting system, or
  (b) in a drainage system, except to connect a fixture trap to a fixture drain in an accessible location.

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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.