An electrical connector includes a connector body, the connector body having a plurality of seats for a plurality of terminal contacts. The electrical connector also includes at least one sealing element received in the connector body in a plane transverse to conductors associated with the plurality of terminal contacts, so as to provide a seal around the conductors. The connector body is provided with a guide passage for slidingly mounting a sealing layer within the connector body, by moving the sealing layer parallel to a plane thereof, in such a way that the sealing layer can be inserted into the connector body after the plurality of terminal contacts along with the respective conductors have been received in the connector body. The sealing layer engages slidingly around the conductors until a final mounting position is reached.