Like all canning jars, the rubber rings and glass lids of Weck jars need to be perfectly tear- and chip-free for the seal to become airtight. For the best results, it is always recommended that you use a new rubber ring for each time a jar is processed with heat.
Rubber rings and lids are available singly or in larger packs. Note that the rings come in 5 sizes. The extra small size is 40mm (you will see the number printed on the glass lid for reference).
It is easy to tell when Weck jars are successfully sealed. Canning jars seal after being taken out of the boiling water bath as they are cooling on the counter top. The changing temperature creates the vacuum seals.
If the jar is sealed, the tab on the rubber ring will be pointing down. Allow the jars to cool fully (preferably for 24 hours) before removing the clamps. Check again that the jar is sealed by lifting the lid. If it is sealed the lid will not lift off. If the lid comes of, either reprocess the jar, or put it in the refrigerator and seat the contents in a reasonable time period.
Refer to the Weck chart to see what size rings you need for your jars.
Extra Small suits the following models: 756, 757,788,789. Inner diameter 40mm, outer diameter 50mm.
Ozfarmer Australia pleased to announce that we are now the Australian Distributor for the world-famous Weck preserving jar. Weck Jars are known throughout the world as the best preserving jars on the market manufactured in Germany with the highest quality and German precision! These are also known as heirloom jars in Europe because they are so well-made they tend to last forever.
