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Amazon.com: Polylok 4" Corrugated Pipe Adapter (4" corrugated to 4" SDR 35 or 4" SCH 40) : Industrial & Scientific
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ADS 4-in x 4-in-Degree Corrugated Adapter Fittings in the Corrugated Drainage Pipe Fittings department at Lowes.com
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Bend-A-Drain 3-in x 3-in-Degree Corrugated Downspout Adapter Fittings in the Corrugated Drainage Pipe Fittings department at Lowes.com
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ADS 4-in x 4-in-Degree Corrugated Adapter Fittings in the Corrugated Drainage Pipe Fittings department at Lowes.com
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Fernco P1070-44 Flexible PVC Corrugated Pipe Coupling for ADS and Hancor Corrugated to Plastic Plumbing Connections
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