Features: Upgrade your pressure canning safety with the Pressure Canner Sealing Rings & Automatic Air Vent, featuring precisions engineered pressure relief and food grade plastic construction for leak proof durability. The air vent resists grease buildup while the reinforced sealing rings withstands 30°C to 220°C temperatures, ensuring 3,000+ reliable cycles across CA16H, CA21H, and 21Qt models. Ideal for home cooks and commercial kitchens needing to resolve E4 error codes or pressure loss caused by worn out gaskets in pressure canners. Perfect for pressure cooking, canning preserves, or maintaining consistent steam sealing during high temperature food processing tasks. Includes installation clip and multilingual guides for effortless replacement (<5 minutes) without tool, restoring performances to vintage 1977 or earlier canners. Specifications: Material: Plastic Size: As Picture Shows Package Includes: 1x Seal 1x Overpressure plug note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color from the item.