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. 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: Presto 2 - 4 quart models Presto 6 - 8 quart models Presto 12 - 22 quart models