The oxygen metal hose is our patent product which consists of four layers(two layers ordinary)different pattern stainless steel: Strengthening course, sealing course. The ring-like bellows is selected because of its long life(spiral profile can cause great torque to reduce the life when work). The radius of curvature is small, it does not have the noise, the operational performance surpasses other hose, moreover the price is reasonable, so it get favorable effect. The size is from DN65-DN500mm.