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. When installing a sealing ring, work it into the cover in four small sections, for example, top, bottom , left and right. Work it into the groove a small section at a time until it is fully in place.* Includes Overpressure Plug.
* Fits Presto Pressure Canner models: 0174510, 175107, 01755, 0175510, 178107
More info, click here: Presto Pressure Canner