This FDA-certified, 0.185-inch thick, white sanitary gasket has an inside diameter of 0.90 inch and an outside diameter of 1.98 inches. It has an envelope (Type 3) connection and is used with tri-clamp fittings. The working temperature is -100 Degrees F to 500 Degrees F. It is made of PTFE with EPDM core and is chemical, high-temperature (400 Degrees F+), water, weather, oil, and steam-resistant.