7.3.4.8.Compression Fittings

(1) No compression fitting connecting to plain end pipe or tube shall be used in a plumbing system unless the pipe or
  tube and fittings are sufficiently stayed, clamped, anchored or buttressed so as to prevent separation during normal service
  of the system allowing for surge pressures.

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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.