This standard practice covers 1/4" – 4" straight size threaded and solder end copper and copper alloy, metal to metal seating, unions for use with copper water tube, ASTM B 88. Included in this standard practice are:
a. Pressure temperature ratings; b. Abbreviations for end connections; c. Size and method of designating openings of fittings; d. Markings; e. Materials; f. Dimensions and tolerances; g. Tests.