It is difficult to get the right part without knowing the model or serial number. In a lot of cases, parts such as the rubber gasket can be used across all models. The serial number is usually located on the bottom of the cooker.
One solution would be to take the cooker to the shop selling the gasket to see if it fits. If you are ordering online, you may want to buy from a seller that offers returns.
The link below takes you to the manual for the type of cooker you have. It may help you locate a hidden serial number.
https://www.qvc.com/footers/cd/pdf/K41143_K43570_K43575_Manual.pdf
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