This marking system applies to valves, fittings, flanges, and unions used in piping connections which include (but are not limited to) flanged, soldered, brazed, threaded, or welded joints. These specified markings serve to identify the manufacturer, the rating designation, materials of construction and special service limitations imposed by the manufacturer. They are used for product identification and to assist in proper application. Review copy is a marked-up BSR draft. Revises previous BSR/MSS SP-25-2008 (orig. BSR-8 submission). Due to previous ANSI/MSS ballot results the draft standard was revised/approved by MSS and is being re-balloted (showing mark-up) within ANSI process. Identified stakeholder are unchanged. Originally developed under MSS Committee 302 (Committee Chair: J. Ballun). U.S. customary units in this Standard Practice are the standard; the SI (metric) units are also included for reference.