I wash it in the dishwasher. It seals my pressure cooker perfectly and I just pop it in the fridge once it's cool enough. Let's face it, pressure cooker chili doesn't keep long enough to put in another container, so this silicone lid lets me put it away overnight. So far I haven't noticed that it retains unpleasant odors, but it doesn't come into direct contact with food either, as I never fill the pot completely. In a nutshell. No, you don't really need it, but it's very nice to have. I use it a lot more than I expected.
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