1.1 This specification covers requirements and test methods for materials, marking dimensions, workmanship, elongation, brittleness, pipe stiffness, and perforations for corrugated polyethylene (PE) pipe and fittings in nominal sizes of 3 to 6 in., inc This specification covers the physical and dimensional requirements and associated test methods for corrugated polyethylene (PE) pipe and fittings intended for underground applications, particularly in soil drainage and septic field leach beds, where s