Abstract: A pressure compensating device for compensating fluid pressure within a sealed enclosure comprises a cylinder divided into a first chamber and a second chamber by a piston, wherein: the first chamber communicates with the enclosure and the second chamber communicates with the environment; the piston is arranged to adjust the relative volumes of the first and second chambers in response to a difference in pressure between the said chambers by moving within the cylinder; and the piston is arranged to allow fluid communication between the enclosure and the environment when the piston is in at least one position within the cylinder.

Abstract: A connection device comprises a lock component of non-circular cross-sectional shape, the lock component being both angularly and axially moveable relative to a housing, stop means operable to limit angular movement of the lock component relative to the housing, the lock component having a threaded drive region, and a drive nut in threaded engagement with the drive region, wherein angular movement of the drive nut relative to the housing when the stop means are not engaged is able to drive the lock component for angular movement, rotation of the drive nut when the stop means are engaged causing axial displacement of the lock component relative to the housing.

Abstract: A pressure compensating device for compensating fluid pressure within a sealed enclosure comprises a cylinder divided into a first chamber and a second chamber by a piston, wherein: the first chamber communicates with the enclosure and the second chamber communicates with the environment; the piston is arranged to adjust the relative volumes of the first and second chambers in response to a difference in pressure between the said chambers by moving within the cylinder; and the piston is arranged to allow fluid communication between the enclosure and the environment when the piston is in at least one position within the cylinder.

Abstract: A connection device comprises a lock component of non-circular cross-sectional shape, the lock component being both angularly and axially moveable relative to a housing, stop means operable to limit angular movement of the lock component relative to the housing, the lock component having a threaded drive region, and a drive nut in threaded engagement with the drive region, wherein angular movement of the drive nut relative to the housing when the stop means are not engaged is able to drive the lock component for angular movement, rotation of the drive nut when the stop means are engaged causing axial displacement of the lock component relative to the housing.