Kilner jar is a rubber-sealed, screw-topped jar used for the storage of food, which was invented by the Kilner family and produced by John Kilner & Co., Yorkshire, England.[1][2][3]
Classically, it was a glass plug with a rubber seal attached to it in the top, with the whole being secured with a metal screw-top lid. Contemporary "Kilner-style" jars usually have a lid made entirely of metal. Kilner jars are used for storing and preserving home-made jams, marmalades and other relishes. They are also used for pickling food such as eggs, onions and garlic.
John Kilner was found to be the great-great-great grandfather of Jeremy Clarkson.[4][5]