An electrical connector having a housing with a mating face and a wire-receiving face. Terminal-receiving cavities extend from the mating face toward the wire-receiving face. A receiving cavity extends from the wire-receiving face to an end wall provided at an end of the terminal-receiving cavities. The receiving cavity has a first section provided proximate the wire-receiving face and a second section provided proximate the end wall at the end of the terminal-receiving cavities. A transition wall is provided between the first section and the second section. A rear cover member is provided proximate the wire-receiving face. The receiving cavity is configured to receive a gang sealing member in the first section or individual wire sealing members in the second section to form a seal between the housing and the respective gang sealing member or the individual wire sealing members.