Twin Sphere Expansion Joint Union Type Size: DN20-DN65Threading: DIN 2999, NPT, BSPTMaterials: Main Body: Neoprene, EPDM, NBR Lining: Chinlon Cord Fabrics Frame: Hard Steel Wires Union: Malleable IronWorking Medium: Vapour, Compressed Air, Cold & Hot Water, Seawater, Oil, Week Acid, Alkali For catalog, pls visit www.hebei-longsheng.com