Manufacturers Standardization Society of the Valve and Fittings Industry 127 Park St NE, Vienna, VA 22180, United States +1 703-281-6613 https://msshq.org/ https://maps.app.goo.gl/MvGoCNG6ErgVpUEFA The Manufacturers Standardization Society (MSS) is a leading authority in valve, fitting, and piping component standards. MSShq.org p