NOVELTY - The element e.g. bushing (24), has a connection piece (15) including a front sided chamber (17) with a connection contact (19) on a front side, and a connection sleeve (20) with an outer thread or outer pattern (26) on a rear side. A hollow cylindrical intermediate element (50) includes a connecting part (52) with an inner thread or inner pattern (54) on a front side, and another connecting part (58) with a passage channel (66) on a rear side. The parts correspond to the sleeve and a coupling nut (30), respectively. An electrical line is guided through the channel at the contact.    USE - Connection element e.g. plug and bushing, for a plug connector (all claimed) for connecting electrical cables, and single or multi wired lines with each other for a solar system.    ADVANTAGE - The utilization of the hollow cylindrical intermediate element allows a specialist to package the plug connector, which unimpairedly meets high safety requirements on site. The element has a compact structure and optimally satisfies safety relevant regulations relative to air and leakage paths. The element is easily handled, and avoids the need for complex packaging and inspection on site. The element reduces material expenditure for contact pins or contact bushings and for detent springs. The element avoids the need for metal clamps, and allows the connection contact to be easily removed from the connection piece as desired without the need for additional tools. The element avoids the need for testing catching of metal springs and a correct positioning of the connection contacts within the connection pieces.    DETAILED DESCRIPTION - The element includes an annular sealing made of rubber or soft plastic.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of a connection element including a connection piece with a connection contact, a sealing, and an intermediate element with a cable sealing ring and a coupling nut.    Connection piece (15)    Front sided chamber (17)    Connection contact (19)    Connection sleeve (20)    Bushing (24)    Outer thread or outer pattern (26)    Coupling nut (30)    Hollow cylindrical intermediate element (50)    Connecting parts (52, 58)    Inner thread or inner pattern (54)    Passage channel (66)