Standard lids are tin-plated with a lacquer coating, double-coated on the inside to food grade and single-coated elsewhere.
When preserving, lids are placed on the bottle on top of the preserving ring and secured with a clip. When first put on the bottle, the lid appears convex, which will change to concave after processing, indicating the vacuum seal has formed.
Size 3 lids fit bottle sizes 14, 20, 27.
