An electrical connector housing system provides a water-tight o-ring seal between a receptacle housing and a plug housing without compressing the o-ring in the mating direction. The housing system includes at least two latch sliders that can be engaged to trap latch tabs within latch slots. The latch sliders are substantially unaffected by the o-ring compression, and are compatible with housing systems of almost any size and/or shape. Embodiments include a connector region surrounded by a curved wall having an o-ring groove in its outer surface, and the plug housing includes a shell which overlaps the curved wall and compresses the o-ring perpendicular to the mating direction. The housings can include integral electrical contacts and/or can accept one or more insertable contacts. The latch sliders. The latch mechanism can include a detent mechanism, and can require a tool for disengagement.