Abstract: Plug-type connector for compression systems, having a housing part and a plug part. The plug part has a plug shaft that can be hermetically inserted into a receptacle opening of the housing part and releasably arrested by a retainer element. Retainer projections, elastically movable in the radial direction, seat the retainer element in an arrested position between an inner annular shoulder in the receptacle opening and an outer annular shoulder of the plug shaft. The retainer element on the plug shaft is axially displaceable between a safety position in which the retainer projections are blocked, and a release position in which the retainer projections are freed for radial release movement.

Abstract: A socketless fitting for releasable connection of a pressurized line. The fitting has a housing body with a receiving opening to insert one end of the line, and an inner sleeve attached in the housing body in an arrangement that extends coaxially within the receiving opening for engagement into the inserted line end. The inner sleeve is fastened in the housing body media-tight around the periphery via connectors and preferably engages in the line media-tight around the periphery. Media-tight outward sealing is accomplished by sealing engagement of the essentially rigidly secured inner sleeve in the line, because the inner sleeve itself is also tightly joined to the housing body.