Abstract: An electrical connector is provided for mounting in an opening in a panel which has an elongated channel having overhanging lips along opposite sides thereof defining a narrowed mouth running longitudinally of the channel. The opening communicates through the channel. A connector housing is insertable into the opening and into the channel in an insertion direction. The housing is rotatable within the opening. At least one locking projection extends outwardly of the housing generally perpendicular to the insertion direction. The locking projection is sized for passing through the narrowed mouth defined by the overhanging lips of the channel and for locking engagement behind one of the lips in response to rotation of the housing within the opening. A latch projection is disposed on the outside of the housing and is latchingly engageable in the narrowed mouth of the channel automatically in response to the rotation of the housing within the opening.