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Strength & Pressure <br />Ductile Iron (DIP) <br />•Overburden Strength (30-40 feet) <br />•Pressure Capacity (300-350 psi) <br />•Resistant Against Poor Soil Support <br />•More Resistant to Freeze-Thaw Effects <br />Polyvinyl Chloride (PVC) <br />•Overburden Strength (20-25 feet) <br />•Pressure Capacity (235-305 psi) <br />•Load Capacity More Installation Reliant <br />•More Reliant on Soil Support