A soft, pliable gasket is a necessity for keeping a pressure cooker operating safely. When a gasket becomes worn or dried out, steam may begin to escape and won't build up properly. This ten-inch silicon gasket is designed specifically for Fagor eight- and ten-quart pressure cookers, and is not intended for use with any other brand. The gasket should be washed in warm, soapy water and rinsed thoroughly before initial use. Suggested replacement is every 12 to 18 months.