The air vent resists grease buildup while the reinforced sealing rings withstands 30°C to 220°C temperatures, ensuring 3, 000+ 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 sealing during high temperature food processing tasks Includes installation clip and multilingual guides for effortless replacement ( <5 minutes) without tool, restoring to vintage 1977 or earlier canners Upgrade your pressure canning with the Pressure Canner Sealing Rings & Automatic Air Vent, featuring precisions engineered pressure relief and food grade construction for leak proof durability