Avoid non-food grade plastics such as PVC (#3) and Polystyrene (#6), as these may release harmful chemicals into the soil.

Food-grade plastics like HDPE (#2), LDPE (#4), and PP (#5) are already used in food packaging, so they are safe for container gardening.

Food-Grade Materials

Get a larger diameter for the water to flow around roots.

Minimum 4-Inch Pipe

ADS Triple Wall HDPE Pipe

ADS Triple Wall HDPE Pipe 4-inch

Uses a Bell and Spigot joining system.

One one end of the pipe is a hub connector, the other end is plain.

Fittings

ADS Single Wall HDPE Bend ADS 4-in x 4-in 90 -Degree Corrugated Elbow Fittings

Does not work with ADS Triple Wall HDPE Pipe.

ADS 4-in x 4-in Corrugated Adapter Fittings

Does not work with ADS Triple Wall HDPE Pipe.

ADS 4-in x 4-in Corrugated Inside Coupling Fittings

Does not work with ADS Triple Wall HDPE Pipe.

ADS 4-in x 4-in Corrugated Cap Fittings

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Silicone 180 Degree U-Bend

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