Abstract: Coupling devices have a housing comprised of first and second housing parts together forming an interior cavity which houses a rotatable coupler, preferably comprised of first and second coupler segments, the device being coupled or not depending upon the coupler's position within the cavity. Each housing part has one or more concave cavity wall portion(s) for rotatably retaining the coupler or a coupler segment in the cavity or in a housing part cavity portion. The coupler or each segment has one or more convex outer surface wall portion(s). The concave cavity wall portion(s) slip fit engage the coupler or coupler segment convex surface wall portions and rotatably retain the coupler or segment(s) within the housing cavity or housing part cavity portion.