Ball jars
Mine came with a fitting for the top of a ball canning jar. Just set the lid on, place the vacuum fitting over the jar, draw a vacuum and when you release it, the lid is pressed to the jar by the outside air pressure and will seal up tight. no rings needed. Good for long term flour storage, rice, potato powder, rolled oats, etc. Lets you use those canning jars you've been stacking up for something while you wait to need them to can fruits and veggies. If you're careful removing the lids you can usually still use them to can with.
Mine came with a fitting for the top of a ball canning jar. Just set the lid on, place the vacuum fitting over the jar, draw a vacuum and when you release it, the lid is pressed to the jar by the outside air pressure and will seal up tight. no rings needed. Good for long term flour storage, rice, potato powder, rolled oats, etc. Lets you use those canning jars you've been stacking up for something while you wait to need them to can fruits and veggies. If you're careful removing the lids you can usually still use them to can with.