National Pressure Cooker Co. National Pressure Canner Cooker Model number 7 Parts. National Model 7 Sealing Ring opn7$12.49 Presto 9911 Over pressure/Automatic Air Vent 09911Regular price: $3.99Sale price: $2.00 Presto 85485 Pressure Canner Regulator Kit 85485$16.99 82087 Steam Gauge 82087$19.98 85443 Body Handle 85443$8.49 85444 Cover Handle 85444$8.49 Presto 85654 Pressure Canner Instruction/Recipe Book 85654$8.49 Presto 85707 Pressure Canner Cooking/Canning Rack 85707$11.49