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Sizing sanitary drain pipes doesn’t have to be overwhelming. In this video, I walk you step-by-step through how to properly size drain piping according to the Wisconsin Plumbing Code (SPS 382). We’ll cover how to read the code tables, apply drainage fixture units (DFUs), and avoid the most common mistakes apprentices and journeymen run into. Whether you’re preparing for your plumbing exam, sharpening your skills in the field, or just trying to get a clearer understanding of code application, this walkthrough will give you the confidence to size drains correctly every time.

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