Abstract: The connection consists of two tubular pieces (1 and 2) clamped end to end against each other by means of a clamp collar the jaws of which (8 and 9) engage with conical slopes (5 and 6) of the connection pieces. Sealing is obtained by the close metal to metal contact of a support surface (17) with its opposite part. A gasket (19) ensures a safety seal in case the contact (17) with the opposite part is not completely sealed.