I spent several months looking for dehydrator racks that fit a 6 liter pressure cooker. Most are too big. It's just the right size. They seem to be quite durable and work very well. So far, I am very satisfied. April 2021 update. I have used dehydrator racks to bake polenta balls using the Instant Pot Air Fryer lid and bake setting. It worked great. I've used every other frame and it was still solid.
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