300# flange 1.Size:1/2'' - 72'' 2.Standard: ASTM ... 48,JIS B1503/B2220, DIN 2573 3.ISO9001, SGS, BV 300# Weld Neck flange 1. Specification Type300# Weld Neck flangePipe ... Size1/2"—72" Pressure150# ,300#, 600#, 900#,1500#, 2500#, PN16, PN25, PN40, 5K,10K, ... from port.2.Product3.Production4.Marking5.Packing & Transportation6. Company 300# Weld Neck flange