ASTM D2513-120 is the Standard Specification for Polyethylene (PE) Gas Pressure Pipe, Tubing, and Fittings. It outlines the requirements and test methods for materials used in fuel gas mains and services, specifically for direct burial and reliner applications. The standard covers aspects such as material dimensions and tolerances, hydrostatic burst strength, chemical resistance, and rapid crack resistance. It ensures that PE pipes, tubing, and fittings are suitable for the distribution of natural gas and includes provisions for qualifying systems for use with liquefied petroleum gas. This specification does not apply to threaded pipe and emphasizes quality control measures for manufacturing processes.