American LOKRING brought along a very impressive and hands-on display of their sealed system compression fittings. This design is actually being used in European markets where the use of a torch for brazing is becoming more restrictive, and the use of propane as a refrigerant is become more common place. Currently, GE is the only American manufacturer to embrace this new system, but the class consisted of changing components on a Subzero unit with the Subzero technical staff showing a lot of interest in the ease at which system components can be replaced as needed. This may be the wave of the future, or it may fade away forever, but it is a neat and clean way to do system repair.