Flange FWN what do you mean?
WN the whole flange means, "F" does not know. Is it the first letter of the word "flange"?.Don't know what to say, I hope you can help. Hello, Zhu Xuechun, Hebei Wan Guan Pipe Industry Co., ltd..
It should be the butt welding flange
WN means butt welding. The overall flange is IF
