This standard describes Cross-linked Polyethylene (PEX) pressure pipe made from material having a standard PEX material designation code of PEX 1006 in ASTM F876 for use as underground water service lines in sizes 1/2 in. (12 mm) through 3 in. (76 mm) that conform to a standard dimension ratio of SDR9. Included in this standard are criteria for classifying PEX plastic pipe materials, a system of nomenclature, requirements, and test methods for materials and pipe. Methods of marking are given. Design, installation, and application considerations are discussed in the foreword of this standard. This is the first edition of this standard and therefore, there are no revisions. An errata to this standard was published in December 2006 that makes the following corrections: Pages ix-x, Eq F.1 and Eq F2; Section 4.3.4, Page 6 "D1598" should read "ASTM D1598"; Section 4.3.6, Page 6 "D1598" should read "ASTM D1598"; Table 2, Page 6, first column (nominal pipe size), second row: garbled number should read "5/8"; and, Section 6.1.2.2, Page 9: Material designation (e.g., PEX 1006).