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Villeroy & Boch Closed Couple Fixing Kit (Donut Seal Seperate)l is one of 2 components available as spare parts to replace existing Villeroy & Boch cistern parts. This is usually purchased with the donut and is used when there is a suspected leak between where the cistern and the pan join together. It is recommended this is replaced every ten years as the donut seal and rubber seals do begin to perish at this point.