T and Cross Fittings
(1) A T fitting shall not be used in a drainage system except to connect a vent pipe.
(2) A cross fitting shall not be used in a drainage system.
Article 7.2.4.1. Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.
Note : Sanitary T – A sanitary tee is a plumbing fixture that allows liquids to drain while also allowing the plumbing system to vent.