cross-connection (cross-con•nec•tion)

1. a physical connection or arrangement between two otherwise separate (piping) systems, one of which contains potable water and the other water of questionable or unknown safety: such as steam, gas, or chemicals. There may be a flow from one system to the other, the direction of flow depending on the pressure differential between the two systems. 2. Unintentional connection between two different systems, e.g. connections between hot and cold water piping.
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