For Presto pressure cookers or canners. Fits into cover and forms a pressure tight seal between the cover and the body during cooking. Fits Model No. 803, 803B, 833, C301A, C301B, 804, 804B, C401A, C401B, 01/PCS4, 02/PCS4, C601A, C603A, 01/PCS6, and 02/PCS6.