Code Library › Volume 1 › Section 7.3 — Piping
PART 7 — PLUMBINGUpdated for the 2024 Ontario Building Code

7.3.3.5.Increaser or Reducer

(1) Connections between 2 pipes of different nominal pipe sizes shall be made with an increaser or a reducer fitting installed so that it permits the system to be completely drained.
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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.