Allows excess steam to escape.Used on models manufactured before 1977.Replaces part No.82060.Fits 2-1/2, 3, 4 and 5.7l cookers; 12, 16, 20 and 5.7l canners.Fits Pressure Cooker: 5.7l No.40; 5.7l Nos.103, 403, 603, 703, 733, 803B,