Abstract: A sealing assembly is provided for a swimming pool skimmer. The sealing assembly includes a rigid frame-shaped face plate (12) with a central opening and having a sealing flange (18) around its outer periphery and further has a protruding section outwardly extending from one side thereof which also includes a peripheral sealing flange. A detachable cover (2) is also provided which is made from a flexible plastic material. The cover (2) has a flat central portion for closing off the opening in the skimmer plate and carries a peripheral lip for engaging the sealing flange around the face plate. The cover (2) also includes a protruding section which carries a peripheral lip which overlays the protruding section of the face plate and engages the peripheral sealing flange thereof.