Lost your gasket during cleanup? No problem! This WMF Perfect Plus sealing ring is designed as a replacement part for the 4.5-, 6.5-, and 8.5-quart WMF pressure cooker lids. An essential component to the pressure cooking process, it is recommended by the manufacturer to replace this part at least every two years or if the ring becomes visibly worn. Hand-Wash recommended to ensure a longer lifespan.