09906 Pressure Cooker Sealing Ring/Automatic Air Vent Pack (4 & 6 Quart) Presto Pressure Cooker Sealing Ring. For Presto stainless steel pressure cookers. Presto Part Numbers 09906 9906 33020. 09906$8.89 For Models C401A C301B C401B C603A C601A C301A 833 02/PCS6 02/PCS4 01/PCS6 803B 804 01/PCS4 804B