Univen pressure cooker gasket seal. Compatible with Mirro pressure cooker models M-0312-35, M-0406, M-0416, M-416M, M-0512, M-0512-11, M-0522, M-0522-11, M-0526, M-0526-11, M-0528 and M-0622. Compatible with Mirro gasket part number S9882. If your model number is M-0512, M-0512-11, M-0522, M-0522-11 and if your model was made before Jan. 1983 then you need the 3440 Gasket. This is NOT a universal part, ONLY compatible with model and part numbers listed in description. Does NOT fit other models of pressure cookers. Quality part by Univen.