Mirro Pressure Canner Gasket S-3440

This gasket fits Mirro and Mirro Matic Canners made before January 1983. To confirm, check the date stamp (Month/Year) on the underside of your canner. This gasket will not fit Mirro canners/cookers if the model number begins with 92***. These gaskets are made from food-grade silicone tested for high temperatures and pressures. Originally white, they switched to black neoprene in the 90s. These have been upgraded to food-grade silicone for better sealing and longer life.