This standard describes crosslinked polyethylene (PEX) pressure tubing made from material having a standard PEX material designation code of PEX 1306, or higher, according to ASTM F876 and intended for use as underground potable water, reclaimed water, and wastewater service lines in nominal sizes 1/2 in. through 3 in. that conform to a standard dimension ratio of SDR9. Tubing may incorporate an optional polymeric outer layer.

Included in this standard are criteria for classifying PEX tubing materials, and a system of nomenclature, requirements, and test methods for materials and tubing. Marking requirements are given. Design, installation, and application considerations are discussed in the Foreword and in Appendix A of this standard.

This standard can be referenced for purchasing and receiving PEX pressure tubing for use as service lines in the construction of underground water distribution systems. This standard can be used as a guide for manufacturing PEX tubing. The stipulations of this standard apply when this document has been referenced and only to PEX tubing.