As used in this article, the following terms shall have the meanings indicated:
Any physical connection or arrangement between two otherwise separate systems, one of which contains potable water from the Village of Clyman's public water system, and the other of which contains water from a private source, water of unknown or questionable safety, or steam, gases, or chemicals, whereby there may be a flow from one system to the other, with the direction of flow depending on the pressure differential between the two systems.