specification : 1/2 inch to 72 inch thickness : sch 5 to sch 130 Buttweld seamless and welded: These are available in different forms that include: 90 LR elbows, 90 SR elbows, 90 reducing elbows, 45 elbows, tees, reducing tees, concentric reducers, eccentric reducers, caps, stub ends, crosses, reducing crosses, 180 LR return bends, 180 SR return bends, laterals, weldolets, stub ends, swage ...