Presto Pressure Cooker Model “B301A”. Parts List for Presto “B301A” Pressure Cooker. Genuine Presto® OEM factory replacement service parts. Service parts for the Presto® model “B301A” may be ordered on-line using the links below. Presto 9978 Pressure Cooker,Pressure Regulator (Jiggler) 9978$8.89 1058 Vent Pipe 1058$8.49 Presto sealing ring 9918 9918$10.99 Presto 85341 Pressure Cooker Cooking Rack 85341$7.49 Presto 49831 Pressure Cooker Instruction/Recipe Book 49831$8.49 These are Genuine Presto® Pressure Cooker Parts.Not aftermarket copies. *Guaranteed to fit! Cooking and Canning Company recommends using only Genuine Presto® parts not (PR) aftermarket copies *”Guaranteed to fit” Presto pressure cooker parts must be installed correctly and pressure cooker must not be modified from OEM. Presto® original equipment manufacturer "Presto" is a registered trademark of National Presto Industries, Inc.