This Standard covers cast Class 125 and 250 copper alloy threaded pipe fittings with provisions for substituting wrought copper alloys for plugs, bushings, caps, and couplings in small sized sizes. This Standard includes: (a) pressure-temperature ratings (b) size and method of designating openings of reducing pipe fittings (c) marking requirements (d) minimum requirements for casting quality and materials (e) dimensions and tolerances in SI (metric) and U.S. Customary units (f) threading requirements (g) pressure test requirements.