Expansion Joint Rubber Seal CR Rubber Size Width 34 mm x Height 40 mm. Extruded Rubber Expansion joint. Used for assembly, installation, connection to concrete. or aluminum sheet It helps to support the expansion and contraction of concrete and aluminum. Tel : 022577145 MB : 0982539956 / E-mail : info@ptigroups.com / Line OA : @PTIGLOBAL