Abstract: A decorative stopper is provided for fitting in the inlet of an existing garbage disposal unit located in a sink drain hole and provided with a sink flange. The stopper comprises a side wall defining a bore and carrying an external sealing member for releasably engaging the inner face of the bore of the existing sink flange, an upper flange extending radially outwardly from an upper end of the side wall for covering the upper face of the existing sink flange, a strainer member extending across the bore and a lower wall extending across the bore below the strainer member and including a plug member moveable between a sealing position and an open position in which fluid may drain through the stopper. A plug operating member extends upwardly from the plug member and through the strainer member to allow the plug member to be lifted to the open position.

Abstract: A relief valve for sanitation systems, said relief valve incorporating a valve seat 11, 25, within a valve chamber 5, 22, and a freely flexible valve element 12, provided for engagement with the valve seat 11, 25 to prevent inflow of air to the valve chamber 5, 22 through an air inlet 10, 26. Guide means 16, 17 are provided for assisting the valve element 12 into sealing engagement with the valve seat 11.