What is a cross connection?
A cross connection is a direct arrangement of a piping line, which allows the potable water supply to be connected to a line, which contains a contaminant. An example is the common garden hose attached to a sill cock at the end of the hose lying is a cesspool. Other examples are a garden hose attached to a service sink with the end of the hose submerged in a tub full of detergent, supply lines connected to bottom-fed tanks, supply lines to boilers.

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1. What is Backflow?
2. What is back-siphonage?
3. What factors can cause back-siphonage?
4. What factors can cause a back pressure-backflow condition?
5. What is a cross connection?
6. What is the most common form of a cross connection?
7. How can you help prevent backflow conditions?