Stop guessing your bathroom plumbing layout — this is what a professional rough-in actually looks like. This cutaway diagram shows a complete residential bathroom plumbing system from fixture to main drain. The 3-inch toilet waste lines connect into a 4-inch main drain for strong, reliable discharge. The sink runs on a 1½-inch trapped drain tied correctly into the stack, while the shower line connects separately to maintain proper flow. You can also see the hot and cold supply lines routed clean
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