A system, comprising: a remnant (120/120') of a tube; and a device for use in securing the remnant (120/120') of the tube through a wall of a pressure vessel, wherein the device comprises: an anti-ejection device (10/10'/210) for attachment to the remnant (120/120') on an interior side of the pressure vessel, wherein the anti-ejection device (10/10'/210) defines a lumen (26/80/26') passing axially therethrough, wherein the remnant (120/120') defines a lumen passing axially therethrough, and wherein the lumen (26/80/26') of the anti-ejection device (10/10'/210) is configured for axial alignment with the lumen in the remnant (120/120'); an end cap (60/260) for attachment to the remnant (120/ 120') on an exterior side of the pressure vessel for sealing an open end (24/244) of the remnant (120/120'); and a connector for passage through the lumen (26/80/26') of the anti-ejection device (10/10'/210) and the lumen of the remnant (120/120'), characterized in that the end cap (60/260) defines an inner threaded channel (62/212) axially aligned with the lumen (26/80/26') of the anti-ejection device (10/10'/210) and the lumen of the remnant (120/120'), and in that the connector comprises an elongate member having a threaded end for connection to the end cap (60/260). a remnant (120/120') of a tube; and a device for use in securing the remnant (120/120') of the tube through a wall of a pressure vessel, wherein the device comprises: an anti-ejection device (10/10'/210) for attachment to the remnant (120/120') on an interior side of the pressure vessel, wherein the anti-ejection device (10/10'/210) defines a lumen (26/80/26') passing axially therethrough, wherein the remnant (120/120') defines a lumen passing axially therethrough, and wherein the lumen (26/80/26') of the anti-ejection device (10/10'/210) is configured for axial alignment with the lumen in the remnant (120/120'); an end cap (60/260) for attachment to the remnant (120/ 120') on an exterior side of the pressure vessel for sealing an open end (24/244) of the remnant (120/120'); and a connector for passage through the lumen (26/80/26') of the anti-ejection device (10/10'/210) and the lumen of the remnant (120/120'), characterized in that the end cap (60/260) defines an inner threaded channel (62/212) axially aligned with the lumen (26/80/26') of the anti-ejection device (10/10'/210) and the lumen of the remnant (120/120'), and in that the connector comprises an elongate member having a threaded end for connection to the end cap (60/260). an anti-ejection device (10/10'/210) for attachment to the remnant (120/120') on an interior side of the pressure vessel, wherein the anti-ejection device (10/10'/210) defines a lumen (26/80/26') passing axially therethrough, wherein the remnant (120/120') defines a lumen passing axially therethrough, and wherein the lumen (26/80/26') of the anti-ejection device (10/10'/210) is configured for axial alignment with the lumen in the remnant (120/120'); an end cap (60/260) for attachment to the remnant (120/ 120') on an exterior side of the pressure vessel for sealing an open end (24/244) of the remnant (120/120'); and a connector for passage through the lumen (26/80/26') of the anti-ejection device (10/10'/210) and the lumen of the remnant (120/120'),