The Ontario Building Code | Required Check Valve

7.2.11.4. Required Check Valve

(1) Where a water service pipe is supplied with water by more than one drinking water system, a check valve shall be installed at each connection with a drinking water system.

(2) Where a fire service main is supplied with water by more than one source, a check valveshall be installed at each connection with a source of water.

Section 7.3. Piping

7.3.1. application