... on flange, forged flange, blind flange,etc Airtight surface type RF, FF, MF, MFM, TG, RTJ ect.size 1/2" - 84 ... ,etcMaterial 316L, 316, 304L, 304, 321, 321H, Rst37.2, C22.8, A105, Q235Class150#,300#,400#,600#,900#,1500#,2500# Production process ...