TOBOGROUP C207 class B class D ASTM A694 F42 steel-ring flanges size 4'' ~144'' Class B 86 PSI and CLASS D 175~150psi 1. Carbon Steel ASTM A694 F42 F46 F48 F50 F52 F56 F60 F65 F70; ASTM A105 A105N A36 ...
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