In the case of a connector comprising two plug parts that can be plugged into one another with front housing parts adapted to one another (100, 200) as well as electrical contact elements (120, 220) adapted to one another, wherein the two front housing parts (100, 200) in the plugged together state overlap on regions facing one another (225), provision is made in particular that the two front housing parts (100, 200) outwardly seal the plug connection resulting from plugging the two plug parts together by means of a sealing lip (125) arranged on the one front housing part (100) as well as by means of an annular groove (230) arranged on the respective other front housing part (200), which is surrounded inwardly by annular rotary sealing surfaces (235, 235′) and surrounded outwardly by an annular rotary collar (225).