The sealing ring fits around the inside rim of the cover and forms a pressure-tight seal between the cover and the body of the pressure canner during canning and cooking. Compatible Products 01/CA16A - 16-Quart Pressure Canner 01/CA16H - 16-Quart Pressure Canner 01/CA21A - 21-Quart Pressure Canner 01/CA21H - 21-Quart Pressure Canner 21 - 21-quart Pressure Canner 21AV - 21-quart Pressure Canner 21B - 21-Quart Pressure Canner 21S - 21-quart Pressure Canner 7 - 16-quart Pressure Canner 7AV - 16-quart Pressure Canner 7B - 16-Quart Pressure Canner 7S - 16-quart Pressure Canner CA16 - 16-quart Pressure Canner CA16H - 16-quart Pressure Canner CA21 - 21-quart Pressure Canner CA21H - 21-quart Pressure Canner