This standard for wrought copper and wrought copper alloy solder joint drainage fittings, designed for use with copper drainage tube, covers: (a) Description (b) Pitch (slope) (c) Abbreviations for End Connections (d) Sizes,and Method of Designating Openings for Reducing Fittings (e) Marking (f) Material (g) Dimensions and Tolerances 1.2 Units of measurement: U.S. customary units are the standard for conversion to metric SI units,, See SI-1, ASME Orientation and guide for use of SI (Metric) units.