Abstract: A rotary pouring nozzle comprising a stationary component having a rotatable component sealingly engaged in it for rotation relative to the stationary component, has an interlocking connection between the components inside the stationary component which retains them in their working relationship. The stationary component has a flow aperture or apertures directed laterally of the rotational axis of the rotatable component with which a nozzle outlet in the rotatable component can be moved into and out of register by rotation of the rotatable component. In one embodiment an enlarged portion of the rotatable component trapped in a complementary recessed portion of the interior of the stationary component provides the interlocked connection, and inert gas supplied by way of gas permeable ring in the stationary component provides lubrication between the components. The stationary component may have non-circular locating engagement with the vessel to which the nozzle is fitted.