Series 12 covers and 12 rings for vacuum vessels
Caps in sheet adaptable to most of the glass jars with commonly marketed opening diameter mm. 82;
Usable with the attack great for glass containers (code 6707 A);
Once you create a vacuum in the jar, you can use the normal cap of the jar as a safety lock.
With the accessory levacoperchi Reber, the jars can be opened without damaging the cover, which is so reusable;