What type of rubber ring went with the zinc caps that have a white porcelain inner side? Is there a source for new rubber rings to fit these lids?
These jars took a round rubber gasket with a tab. The only source that I know of today where these rings can be found is at http://www.homecanningsupply.com/ or you can get boxes of the old gaskets on eBay. The modern two-piece metal cap and ring with a new jar is the best system for home canning. It can be dangerous to use the old lids and jars to can today. Subject: (2) Historical information and dating.