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 16-Quart Pressure Canner 0174510 18-Quart Pressure Canner 0175107 16-Quart Pressure Canner 0175510 23-Quart Pressure Canner 0178107 23-quart Pressure Canner 0178209 23-Quart Induction Compatible Pressure Canner with stainless steel-clad base 0178410