ISO-F Stainless Steel Vacuum Bellows, Metal Bellows Expansion Joints Zhucheng Yongbang Pipe Co., Ltd. Base Info Model NO.:YB00103Standard:ISOMaterial:Stainless SteelConnection:Flange Description Pre:Tinmen′s Revits (Iron) Next:DIN931&DIN934 Bolt Nut OEM (ISO9001-2010)