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Schedule-40 4" PVC Rigid Conduit Couplings for Commercial, Industrial and Utility Usage (10) - Amazon.com
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Charlotte Pipe 4-in x 4-in PVC DWV Cast-Iron Adapter in the PVC DWV Pipe & Fittings department at Lowes.com
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LASCO PVC Coupling, Socket x Socket, 4" Pipe Size - Pipe Fitting: Amazon.com: Industrial & Scientific
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