1.1 This specification covers requirements and test methods for triple profile wall polyethylene pipe and fittings. The nominal inside diameters covered are 30 to 60 in. [750 to 1500 mm]. 1.2 The requirements of this spec This specification covers requirements and test methods for triple profile wall polyethylene pipe and fittings. The requirements of this specification are intended to provide pipe and fittings suitable for underground use for non-pressure sanitary sewe