coupling link to expansion, especially for connecting the tubular base support of the road signs.said coupling is connected to predetermined rupture in case of shocks or strong stress decrease.the gasket is composed of a central pivot, which causes the expansion of one or more cylindrical portions by means of opposing cones; also has a reduced section for rupture when the gigrease is inserted inside of the tube to support the traffic signal is expanded, form single body with the pipe and determines the connection between the tube and support base.as well as between two parts of the tube itself.
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