The pressure regulator fits onto the vent pipe to indicate when 6.8kg pressure is reached, and controls pressure in the unit.A gentle rocking motion of the pressure regulator indicates that proper cooking pressure is being maintained.This Part No.09978 also replaces Part No.09913.Fits Presto Pressure Cooker models: 126407, 128202, 01/PCE4H, 0124104, 0126410, 0128206, 0134108, 0136210, 0216001, 131001, 134001, 134103, 134104, 135001, 135004, 136001, 136102, 136203, 01/PCE4A, 136403, 01/PCE4, 02/PCA4, 02/PCA4H, 02/PCA6, 02/PCA6H, 121001, 02/PCS4, 02/PCS6, 01/PCD4H, 01/PCD4, 215102, 126306, 126105, 126104, 126102, 01/PCE6, 126002, 125005, 125004, 125002, 01/PCE6A, 124102, 124001, 122104, 122102, 122101, 121004, 121002, 700 (2.8l), 700 (2.8l), 700 (2.8l), 703, 704, 706, 733, 01/PS6, 803B, 804, 804B, 833, A401, A403A, A403AD, A403AT, A409, A410A, A411A, A412A, A413A, A414A, A415A, A416A, A601, A603A, A603AD, A603AT, A607A, A608A, A609A, A610A, A611A, A612A, A613A, A614A, A615A, A616A, A617A, A618A, A619A, A620A, A621A, A622A, A623A, B301A, B301B, B302A, B401A, B401B, B403A, B601A, B602A, B604A, B605A, C301A, C301B, C401A, C401B, C601A, C603A, KE02A, KE02AT, KE03A, KE03AT, PB01A, PB02A, PB05A, PB06A, PB07A, PB08A, PB09A, PB10A, PB11A, S-60, S-66, SC-35