A substantially tubular shaped insert (1) adapted to fit coaxially about the end of a hose and to be contracted against the hose by the shell of a coupling to provide an improved hose and coupling assembly for the conveyance of fluids under pressure. The insert has a separation space (2) in its wall...http://www.google.es/patents/US4319774?utm_source=gb-gplus-sharePatente US4319774 - Hose and coupling assembly
