Abstract: A connector backshell adaptor comprises a body portion (1) and a rotatable coupling nut (2) at one end. The body portion is provided with annular flanges (5,6), a sheathing (7) being clamped in the zone (4) between the flanges by means of at least one steel spring (8) which provides a constant pressure 360.degree. around the body portion. Where two springs are provided these may be wound in either the same or opposite directions. In the constructions described the adaptor is re-usable, since the sheathing can be removed by releasing the constant pressure provided by the spring or springs.

Abstract: A connector for latch type plugs has an inner member and an outer member with a resilient member between them. If a first plug is inserted in the connector, it overrides the central line as its latches engage recesses in the inner member. When the second plug is inserted into the connector, its front edge abuts against the front edge of the first plug. Further movement of the second plug causes corresponding movement in the first plug and the inner member, thereby compressing the resilient member. When the latches of the second plug have engaged with the corresponding recesses, the pressure of the resilient member, transferred via the inner and outer members, holds the front edges of the two plugs together.