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ANSI/MSS SP-25-2018

Standard Marking System for Valves, Fittings, Flanges, and Unions

This standard marking system applies to the marking of new valves, fittings, flanges, and unions used in piping connections that include (but are not limited to) flanged, soldered, brazed, threaded, or welded joints.

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Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. [MSS]


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As the voice of the U.S. standards and conformity assessment system, the American National Standards Institute (ANSI) empowers its members and constituents to strengthen the U.S. marketplace position in the global economy while helping to assure the safety and health of consumers and the protection of the environment.

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