en1092-1 type 11 welding neck flange, 1/2 inch TO 80 inch, carbon steel, stainless steel 1.welding neck flange/WN flange/flange 2 ... . 10years professional service 3.Size:1/2"-80aa,TUV,PED,ISO 4.To be equality WN ... ,E,F,H, JIS:5K,10K,16K,20K,30K· Face Type: F.F., R.F., R.T.J. Stangard ASME B16 ...