Abstract: A sealed, tube-to-tube connection is made up of a first tubing member, a second tubing member and an elastomeric O-ring, the connection being free of any separate member to maintain the first tubing member, the second tubing member and the elastic O-ring in assembled relationship. The first tubing member is provided with an outwardly projecting annular bead at a location inwardly of a free or distal end of the first tubing member, and an outer diameter pilot portion of reduced diameter between the annular bead and the free or distal end of the first tubing member. The second tubing member is provided with an enlarged diameter end portion, a first enlarged portion axially inwardly of the enlarged diameter end portion and an annular shoulder joining the first enlarged diameter portion and the enlarged diameter portion.

Abstract: A screw plug having a multiple-thread configuration formed along a screw shaft, wherein the multiple-thread configuration is configured to reduce the number of revolutions required to set the screw plug into a pressure vessel for repair of a puncture therein. The screw plug may be combined with a sealing agent to improve the airtight seal created by the insertion and setting of the screw plug, which sealing agent is configured to bond with the pressure vessel, thus providing a more long-term repair. A screw plug having a thread configuration with a flat upper pressure surface is also disclosed.