Abstract: A cover is provided for an end of a conduit. The cover comprises a front face covering the conduit end and a back face having fasteners for attachment to a conduit. A plurality of apertures pass between the front face and back face to allow the flow of liquid to and/or from the conduit. The edges of the front face defining the entrances to the apertures are non-planar. In addition to, or as an alternative to, the apertures are formed such that the flow of liquid between the front and back faces is deflected so that the liquid follows at least two directions in passing between the front and back faces. The cover can be used as a grille over drainage in a swimming pool.