To find your parts locate your model number. If you have a newer model, you can usually find your model number on the bottom of the pressure cooker or canner body. If it's a very old model, the number can probably be found on a label attached to the top of the cover. NOTE: 409A -This is not a Pressure Cooker Model. All Presto Pressure Cookers have the number 409A stamped on the bottom. This is the UL number. Old units have model numbers like 40, 50, 204, 603, etc. Newer models usually start with 01/ or 02/ followed by letters like PA or PC and more letters and/or numbers. The most recent styles always have seven digit (all numerical) model numbers starting with 01 or 02 (Example: 0136001). Next find your part numbers on the following parts charts, or on the parts below.: Presto 2 - 4 quart models Presto 6 - 8 quart models Presto 12 - 22 quart models