Abstract: A sealed electrical connector assembly is provided having a connector position assurance device (CPA) including at least one CPA support rail and a CPA latch finger. A plug housing is provided with a body section having a mating interface on one end thereof that retains a plurality of plug contacts. The plug housing includes a shroud extending about at least a portion of the body section and is spaced apart from the body section by a predefined gap. A header is provided having a base retaining a plurality of header contacts adapted to electrically engage the plug contacts. The header includes walls defining a plug receptacle adapted for receiving the mating interface. The walls are received in the gap between the shroud and the body section of the plug housing. A seal is mounted to one of the plug housing end header to form a hermetic seal between the plug housing and header when fully mated with one another. A CPA retention assembly is mounted to at least one of the plug housing and header.