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What is the difference between a secondary line and a mainline?

April 26, 2017line mainline Secondary

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What is the difference between a secondary line and a mainline?

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A. Secondary lines are lines that handle the waste from only one fixture such as a kitchen sink or tub while a mainline handles the drain waste for the entire building. Imagine a tree with the smaller branches on top being the secondary lines. They all lead into the trunk of the tree which is like the main line.