WN Flanges 304, 304L, 316, 316L, 321, S31803 Certification: BV, ABS, GL, PED, ISO9001 Kind :WN, SO, ... , BL Slip On Flanges - ANSI B16.5 Stainless Steel 304L,316L ect. Standard Chinese Flange Used in Pipeline,Transport ISO9001-2008 ... B 16.5GradeTP304,304L,304H,316, 3I6L,316H,317,317L, 321, 347RangeSORF, BLRF, SWRF, WNRF,SCREWED.Class150,300,600, 900, 1200 ...