... 4.ISO9001-2000/SUV Product name:Pipe fitting stainless steel union· Country of origin: China· Carbon steel: A234 WPB. A105, WPI 5L , A860 ... , WPHY-52, WPHY-60, WPHY-65, and WPHY-70· Alloy steel: A234 WP1, WP5, WP9, WP11, WP12, WP22, WP91, and WP92 ... A420WPL6· Stainless steel: A403/WP304/WP304L/WP304H/WP316/WP316L/WP317L/WP321· Sizes: 1 ...