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 offittings;d. Markings;e. Materials;f. Dimensions and tolerances;g. Tests.