Presto Pressure Cooker Sealing Ring/Automatic Air Vent Pack (4 Quart) Includes Automatic Air Vent. Replaces Presto parts 50076 & 33015. Fits Presto Pressure Cooker models: 700 (3-qt), 700 (4-qt), 703, 704, 733, 744, B301A, B301B, B401A, B401B