6" Standard Extra Heavy Cast Steel Valve Pressure 300 - 500 Lbs.
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6" Standard Extra Heavy Cast Steel Valve Pressure 300 - 500 Lbs., item, June 6, 1921; (https://texashistory.unt.edu/ark:/67531/metapth1141464/: accessed October 19, 2019), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting Texas Parks & Wildlife Department.