Eric Aune, a master plumber licensed in Minnesota, walks through the realities of pipe transitions in older homes — specifically how to connect dissimilar materials like cast iron, PVC, and copper DWV using the right couplings. He distinguishes between shielded couplings, which use a stainless steel band for strength and a full 360-degree seal, and no-hub couplings, which are designed strictly for cast iron to cast iron connections. He also covers fernco donuts, the evolution away from lead-packed joints, and the code-required method for joining PVC to ABS plastic. The conversation touches on why cast iron remains standard in commercial construction and why copper drain lines, while still functional, are no longer installed.

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