ISO Hydroformed Flexible Bellows are used to connect parts together when a solid straight connector is impractical or where the two parts move independently and flexibility is required.Manufactured from: 304 Stainless Steel. Helium Leak tested to 10-8 mbar. ISO Hydroformed Flexible Bellows are supplied in a plastic bag with protective plastic caps.ISO Hydroformed Flexible Bellows are manufactured to the ISO Standard and are compatible with other supplier’s product.