... rubber expansion joint 1used in air,water,oil,acid 2shock absorption 3easy installment and flxible 4.ISO9011 rubber joint description:1 ... .used in air,water,oil,acid,2.have shock absorption3.easy installment and flxible 4.ISO9011-2000Performance:Rubber ... non-parallelism.3.It reduces structural noise transmission with strong shock absorption in service.4.The inner seamless high-pressure rubber ...