1.material:rubber 2. with certificate according to-EN599,BS3212,DVGW Cixi xingcheng ... of regulator we produce have the CE certificate(regulator-EN12864, rubber hose-EN559,BS3212,DVGW), exported to more than 20 countries and ... cooperation. Your support will be our valuable wealth! Specification: material:rubber ID:6.3MM 8MM 10/11MM