1,Double Sphere Screwed Rubber Expansion Joints 2,Rubber Expansion Joints 3,ISO9001 and CE certificate 4,do OEM Double Sphere Screwed Rubber Expansion JointsPortion Material1,Main body Polarized rubber2, Lining Nylon cord fabric3, Frame Hard steel wire4 ,Union Forgeable cast iron Techmical Consition Parameter3/4" --- 3"Working pressure (MPa)1.0Bursting Pressure (MPa3.0Vacuity (mmHg)400 Table of ...