YouÕre getting a 2 1/2 socket weld flange in 304 Stainless Steel built around a raised face sealing surface and 150# pattern. Need a dependable connection point for your piping run? Socket weld flanges are popular when you want a clean, compact connection and a strong joint after welding. ItÕs built with a raised-face surface to help create a confident seal when paired with the right gasket. Once welded, the connection is stable and helps keep the assembly from shifting under typical plant vibration. 304 offers a strong balance of durability, availability, and value. If youÕve ever needed to bolt pipe to a valve or piece of machinery, this socket weld flange is the part that makes that connection possible.