Abstract: Apparatus for separating slugs of fluid of one phase flowing through a conduit which is conducting fluid of another phase comprising an elongated inlet manifold connected to an inlet conduit at one end and being of sufficient cross-sectional flow area to reform the fluid flow from the inlet conduit into substantially channel flow for the liquid entering the inlet manifold. A liquid discharge manifold is located below the inlet manifold and is connected to the inlet manifold by a plurality of downcomer conduits which are spaced apart one from the other along the length of the inlet manifold. A gas discharge conduit is connected to the downstream end of the inlet manifold and to a gas-liquid separator for demisting the gas discharged from the inlet manifold. Gas blow-by through the discharge manifold is prevented by a liquid trap formed by a liquid discharge conduit connected to the liquid discharge manifold.