3-1/2" Pipe x 3-1/2" Code 61 Socket Weld Flat Socket Weld Pipe Flange, Carbon Steel, Kit - W72-56-56UFlat Socket Weld Pipe Flange, Carbon Steel, Straight, 3 1 2" Pipe Side 1, 3 1 2" C61 Socket Weld Flange Side 2, Kit with Flange, Bolts, O Rings W72 56 56U Face Style: O Ring Fitting Angle: Straight Flange Code: Code 61 Socket Weld Flange Size: 3 1 2 in Side 1 Size: 3 1 2 in Side 1 Type: Pipe