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The red sealing ring is just a spare that comes with the unit. There is already a clear/white sealing ring installed in the lid.
Sorry, there was a problem. Please try again later.A red sealing ring is for convenience; use red for spicy foods; blue for sweet foods; use clear for any, just be aware the sealing rings may retain food smells. This is why it's a good idea to have a couple of rings that you alternate.
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