Abstract: An electrical connector having first and second interfitting sections, a locking member movable with respect to said sections and having two stable positions one for locking the two sections together and the other for unlocking the two sections. An electric contact is carried by one of said sections to provide an indication of the locked or unlocked status of the connector which is closed by said locking member as it reaches the locking position and opened as it reaches the unlocked positon.

Abstract: A push -- pull connector including a sleeve lockable to a spigot by locking balls controlled by a sliding member mounted on the sleeve, wherein the sliding member has a stable locked position and a stable unlocked position, with no intermediate stable position. The stable positions are determined by a resilient ring mounted in a groove on the sleeve and not by any spring action on the balls. The arrangement may be such that the force necessary to move the sliding member from unlocked to locked position is just greater than the force necessary to effect full engagement of the spigot and the sleeve.