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The Plumber's Choice Shielded 8 in. Steel Transition Coupling Connects Cast Iron to Plastic or Extra Heavy Cast Iron H-38122 - The Home Depot
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plumbing - Pros and cons of coupling vs. threaded when transitioning from copper to PVC - Home Improvement Stack Exchange
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How to join cast iron pipe or copper pipe to plastic pipe using fernco couplings.Plumbing Tips! - YouTube
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