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By certification 
Weld Neck Flange, Slip On Flange, Steel Pipe Flange,
Threaded Flange, Integral Pipe Flange, Socket Weld Flange,
Blind Flange, Orifice Flange, Reducing Flange,
Loose Hubbed Flange, Welding plate Flange, Welding Neck Collar,
Stub End, Spectacle Blind Flange/ 8 Figure Blind Flange.
