The Ontario Building Code | Corrugated Steel Pipe and Couplings
220.127.116.11. Corrugated Steel pipe and Couplings
(3) Couplings for corrugated steel pipe shall be constructed so that when installed they shall,
(a) maintain the pipe alignment,
(b) resist the separation of adjoining lengths of pipe,
(c) prevent root penetration, and
(d) prevent the infiltration of surrounding material.