Rubber Le Parfait Glass Canning Jar 100mm Replacement Gaskets for 3 L Super Jars & 1000g Terrine Jars (Large Size) - Pack of 12 Includes 12 Replacement Gaskets for wide mouth Le Parfait French Canning Jars Outside Diameter: 4 1/4" Inside Diameter: 3 1/4" As your old gasket may have stretched, refer to the size and type of jar for correct size gasket Le Parfait jars are French jars which have been designed specifically for canning and making preserves. Fits 3L Super Jar -- 1,000g 750g 500g Terrine Jars(not the 'Super Jar')