The Kilner Genuine Preserve Lid Seals Pack of 12 are for use with Kilner preserve jars. An essential piece of equipment for any home preserver, they are suitable for use on 250ml, 500ml and 1L Kilner preserve jars. When used with the screw bands, their built-in rubber rim creates a vacuum seal for safely processing foods in a boiling-water bath, so your homemade preserves stay airtight and fresh. When the lid is pulled down in a dip toward the food in the jar, a good vacuum seal has been achieved.
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