What is back-siphonage?
Back-siphonage is the reversal of normal flow in a system caused by a negative pressure (vacuum or partial vacuum) in the supply piping.

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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?