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FLEX Drain by Amerimax 4-in x 4-in-Degree Corrugated Coupling Fittings in the Corrugated Drainage Pipe Fittings department at Lowes.com
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Advance Drainage Systems 4 in. D X 100 ft. L Polyethylene Slotted Single Wall Perforated Drain Pipe - Ace Hardware
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ADS 4-in x 4-in-Degree Corrugated Inside Coupling Fittings in the Corrugated Drainage Pipe Fittings department at Lowes.com
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Flex-Drain ADP53302 I.D. to 4-Inch I.D. Pipe Connector, Landscaping Drain Pipe Adapter,black - Pipe Fittings - Amazon.com
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