The Ontario Building Code | Cleanout Fittings
7.2.10.3. Cleanout Fittings
(1) Every plug, cap, nut or bolt that is intended to be removable from a ferrous fitting shall be of a non-ferrous material.
(2) A cleanout fitting that as a result of normal maintenance operations cannot withstand the physical stresses of removal and reinstallation or cannot ensure a gas-tight seal shall not be installed.
(3) A screw cap or test cap shall not be used as a cleanoutplug or cover.
In Plain Language
Every plug, cap, nut, or bolt intended to be removable from a ferrous fitting must be made of non-ferrous material, preventing rust-seizure that would make a cleanout fitting impossible to open when needed.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.