Abstract: The invention provides for a screening element which is predominantly of a synthetic plastics material and which has a screening surface formed by a plurality of ribs extending within a surround across the element, the ribs each being of a zig-zag configuration and the ribs being spaced from each other to define between them screening apertures, the ribs being resiliently deformable.

Abstract: There is provided a screening panel having screening apertures and which can be secured to a support frame side-by-side with similar panels to form a screen deck. The panel has ridges along two of its sides which project above the screening surface. The ridges form a channel which confines liquid flowing across the screen deck to flow across the screening apertures. Grooves extend through the ridges to direct liquid flowing across the screen deck directly into the screening apertures.

Abstract: The invention provides for a fastening arrangement for a screening or lining panel in which the fastening arrangement includes half-tubular protrusions along the periphery of the panel which can fit in pairs into corresponding apertures in a support frame. The bore of each half-tubular protrusion is blanked off so that when a pair of such protrusions are fitted in an aperture in a support frame, a blind bore is formed. The fastening means further includes a pin which can be inserted into the bore formed by a pair of protrusions fitted into an aperture. The pin when inserted into the bores of the protrusions spreads the ends of the protrusions and thereby fastens the panel to the support frame.