National Pressure Cooker Co. National Pressure Canner Cooker Model number 7 Parts. National Model 7 Sealing Ring $12.49 Presto 9911 Over pressure/Automatic Air Vent $3.49 Presto 85485 Pressure Canner Regulator Kit $16.99 82087 Steam Gauge $19.98 85443 Body Handle $8.49 85444 Cover Handle $8.49 Presto 85654 Pressure Canner Instruction/Recipe Book $8.49 Presto 85707 Pressure Canner Cooking/Canning Rack $9.49