Plug connector

A plug connector for connecting to a mating plug connector along an insertion direction. The plug connector includes a housing including an interior and a contact element situated in the interior. The plug connector further includes a connector position assurance. The housing includes a pressure equalization element for equalizing the pressure of the interior with respect to the exterior of the housing. The CPA is situated at the housing and is movable between a first position and a second position relative to the housing, a sealing element being provided at CPA, the pressure equalization element being sealed with respect to the exterior by the sealing element in the second position.