This video explains the main functions and practical uses of ASTM 403 WP321 stainless steel pipe fittings in a clear, step-by-step format. You'll see a detailed walkthrough of seamless butt weld elbows, return bends, and other fittings, learn about their compliance with ASME B16.9 and NACE MR0175 standards, and discover how they perform in demanding applications like petroleum, power, and chemical industries.