Pack of 5 units of vacuum valves of 2.2 cm in diameter, from Tre Spade. Necessary accessory to create a vacuum in glass jars with metal lids, using the Tre Spade vacuum sealer or the Tre Spade manual vacuum pump. The vacuum valves offer the unique possibility of using glass jars with a metal screw cap, that is, the jars that are usually used in canning, to preserve under vacuum in a very simple way: If the vacuum is made with the Takaje, Deluxe or Wendy Premium vacuum sealer, the included applicator is used to fix the valve on the lid. If vacuuming with the Tre Spade handheld vacuum pump, no applicator is needed as the valve fits into the bottom of the applicator. Vacuum jars with the Takaje valve can be used for sous vide cooking, as long as the jar is heat resistant.