1,single sphere rubber expansion joint 2,rubber expansion joint 3,ISO9001 and CE Certificate 4,do OEM single sphere rubber expansion jointSpecification:1, DN32 ... , general presure:DN32-DN400:2.5MPa.DN350-DN600:1.6MPa,DN700-DN1200:1.0MPa,DN1400:0.6MPa,DN1600-DN1800:0.4MPa,flange ...