Incorporating an additional vanity sink and connecting it to the current galvanized system with PVC tees as shown in the sketch—does this configuration comply with venting and trap arm regulations? What are some typical pitfalls I should be cautious of during installation?
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Make sure the sink’s trap arm isn’t too long, or you’ll have slow drains. See what the distance rules are locally. Use the right kind of sanitary tee, so the water flows well. Connect to a vented line, not just any drain, or you’ll have siphon traps. Keep a consistent slope, and don’t mix certain pipe types without the right connectors. Watch out for hidden dips that can cause blockage.
It’s fine if each sink has a proper trap, vent within code distance, and correct slope. Common mistakes: flat venting, exceeding trap arm length, improper tee orientation, or mixing materials without the right transition fittings.