A method for forming at least one barrierless, embedded metal structure comprising the following steps. The outside pipe end includes a sealing zone having a collapsible sealing slot that enables the outside pipe end to be drawn tight over the outside surface of the inside pipe end via the band clamp to thereby provide a fluid-tight seal between the pipes. The first and second mating portions are coupled to each other by the positioning of a magnet proximate the surface of at least one\u2014and preferably both\u2014of the first and second mating portions. The piston may be a component of the compressor and the cylinder may be a component of the displacer, or vice versa.