This 3-piece replacement kit contains a new vent pipe (model No. 01058), pressure regulator model No. 09978 (SKU 615481), and instruction book for selected Presto pressure canners and manufactured prior to 1950. It replaces the existing vent pipe and petcock pressure control weight (model No. 85073) which are no longer available. Used on Presto model No. 7, 7S, 7AV, 21 - 21S, and 21AV.