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Drain line
A drain line carries used water away from sinks, tubs, showers, and toilets.
Why it matters
Bad slope, poor venting, and poor connections cause slow drains, clogs, and smells.
Where people get this wrong
A drain is not just a pipe. It is part of a system that needs venting. A drain that leaks can hide damage in a wall or floor for a long time.
Real-world example
A sink drains slow no matter what you do. The trap is clean. The real problem is often venting or slope, not a clog.
Where this hits your build
This comes up during rough-in and final fixture installation. Accessibility for future repairs matters as much as the initial install.
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