Patent ID: 7128143

Claim:
A wellhead having an external sealing apparatus for clamping a tubing member having a first diameter within a tubing member of larger internal diameter, the arrangement comprising an outer tubing member having an inner circumferential wall with a sealing zone therein; an inner tubing member adapted to be positioned substantially concentrically within the outer tubing member having an outer circumferential wall with a sealing zone therein; and a circumferential compression system mounted outwardly of the outer tubing member adjacent a sealing zone and operable to be activated for compressing the outer tubing member into full circumferential contact with the inner tubing member for engaging the sealing zones therein and activating a full circumferential seal between the outer tubing member and the inner tubing member, wherein the sealing zone is a metal sealing surface on each of said tubing members for defining a full circumferential metal-to-metal seal when the compressions system is activated.