Rationale

• Remove reference to Terminology D1600 and D2749 in the referenced documents list in section 2, as well as in 3. Rationale: D1600 withdrawn and D2749 Symbols are not used in the body of the standard. • Revise citations of NSF standards in section 2.8. Rationale: NSF standards are to be cited consistently with the way NSF titles them. • Revise citations of PPI publication in section 2.9. Rationale: PPI technical notes are to be cited consistent with the way PPI titles them. • Added parts of speech to definitions in 3.2. Rationale: See ASTM Form and Style. • To remove the definition of “standard dimension ratio” in 3.2.3, renumbering following sub-sections. Rationale: This term is defined in F412, only is mentioned once in the body of the standard, and as written refers to a Table that does not exist in the body of this standard. • Revised X1.1 to explain that the Plastic Pipe Institute makes recommendations not just of HDS, but also HDB values. Furthermore, it is added that the PPI HDS recommendations are for water at 73°F only. • Mandatory language removed for X3 with addition of a sentence noting that a certifying agency may require the described quality program to be followed. Rationale: See ASTM Form and Style.