This Standard Practice covers copper and copper alloy unions with metal-to-metal seating@ in nominal sizes 1/4 through 4@ with solder-joint or threaded end connections@ and for use with copper water tube that is compliant with ASTM B88. Included in this Standard Practice are: a) Pressure-temperature ratings b) Abbreviations for end connections c) Description and terminology of parts d) Materials e) Size and method of designating openings of fittings f) Design elements g) Dimensions and tolerances h) Testing i) Marking