Abstract: Apparatus (30) for the sealed fixing of a tube (1) at the point where it enters a receptacle is provided. One end (10, 11) of the tube (1) forming a ball joint (7, 8, 10, 11), cooperating with a component (7, 8) made of flexible material, is rigidly mounted in relation to the receptacle. The apparatus (30) has: a sleeve member (14), through which tube (1) passes and which is designed to be mounted integrally with the receptacle; and at least one O-ring (3, 4), against the tube, O-ring (3, 4) being housed in a groove in that part of the sleeve member (14) facing the tube (1).

Abstract: A tube extends through a wall of a vessel and is adapted to carry an ultraviolet emitter for use with a photochemical reaction vessel. An end of the tube disposed outside of the vessel is mounted within a support which forms a ball joint for that end of the tube. That joint allows the tube to pivot slightly in response to forces acting on the portion of the tube disposed within the vessel, thereby resisting any breaking or bending of the tube which might otherwise occur. A lip seal is disposed around the tube at a location intermediate the ball joint and the vessel to prevent the escape of fluids from the vessel past the tube.