Tubular couplings and connectors

A tubular coupling comprising a first component having an axis and comprising a tubular male spigot with a headed formation on the outside thereof and a second component having an axis and comprising a socket for receiving the headed formation on the tubular male spigot in releasable manner and a flow passage communicating with the socket and collinearly with the axis of the tubular male spigot in the installed position, wherein co-operating guide surfaces are provided on the headed formation and the socket with the guide surfaces being of part spherical or part cylindrical shape centered at a common center about which the two components can be rotated relative to each other in order to bring the axes of the first and second components in alignment and the guide surfaces co-operate to hold the headed formation of the tubular male spigot axially captive relative to the socket, wherein the first and second components have the headed formation and socket shaped to enable introduction of the headed formation into the socket by way of a mouth to the socket with the tubular male spigot being configured to be moved along its own axis when it is arranged transversely at right angles to the axis of the flow passage through the socket with these axes intersecting at the common center and wherein an opening diametrically opposite the flow passage receives the tubular male spigot in the installed position thereof, and wherein a cooperating seat and seal arrangement is provided for sealing an adjacent end of the tubular male spigot to the flow passage where it communicates with the socket, with the seat and seal arrangement including a resiliently deformable seal carried either on a free end of the tubular male spigot or in a recess surrounding the flow passage in the socket such that the seal defines the seat, wherein in the installed position the seal is positioned at the longitudinally outermost free end of the spigot and extends to the seat of the socket.