Current Quebec regulations require the installation of backflow prevention devices to protect drinking water systems against backflow. Backflow is caused by siphoning or back-pressure, and is blocked by an air gap or a backflow prevention device. A backflow prevention device is a mechanical system consisting of two valves. 

N.B. : A check valve is not a backflow prevention device. Servitech is a member company that has successefully completed the training on testing of backflow prevention devices. RBQ CMMTQ

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