Pyrex Lid vent plug
thingiverse
This is a replacement vent lid for Pyrex containers like the one you can find at this link: https://www.pyrexware.com/pro-3-qt-round-vented-plastic-lid-turquoise/1121732.html#start=33. This item specifically replaces the center vent cover on the lid. Please note that whether or not this is safe for food use or microwaving depends on the material used to print it. I printed mine using ABS plastic, which made it flexible. The design was created with Tinkercad and can be edited online at https://www.tinkercad.com/things/dBpGuZqLRg3.
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