7.6.2.3.Backflow Caused by Back Pressure

(1) Except as provided in Sentence (3) and Articles 7.6.2.4. to 7.6.2.6., where a backflow preventer is required by this
     Subsection, the backflow preventer shall be selected, installed and tested in conformance with CSA B64.10, “Selection
     and installation of backflow preventers.”

     (2) Backflow preventers shall be provided in conformance with Sentence 7.2.10.10.(1).

     (3) Tank-type water closet valves shall be provided with a back-siphonage preventer in conformance with
     Sentence 7.2.10.10.(2).

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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.