The present invention provides a releasable tube fitting that provides secure connection of a tube to the fitting while the fitting is under pressure. The cup holder is selectively movable about an axis between a stowed position and a deployed position. The feet are weldable to the surface of the plastic while the plastic is in a molten state. Thus, to minimize angular error, the workpiece is tilted about an axis substantially perpendicular to the dimension having the higher degree of parallelism.