1.1 This specification covers requirements and test methods for annular, corrugated profile wall polyethylene pipe and fittings with an interior liner. The nominal inside diameters covered are 12 to 30 in. [300 to 750 mm]. This specification covers requirements and test methods for annular, corrugated profile wall polyethylene pipe and fittings with an interior liner. The requirements of this specification are intended to provide pipe and fittings suitable for undergroun