Once the over pressure plug seals the jiggler lets out steam from 5 lbs up to 15 lbs. It's not a jiggler but a spring loaded pressure release valve.
I do need to change it out to be safe, I trust the jiggler compared to this. I checked the new Presto and it's smaller than this, I think it's 1/4". I think I'll have to use a Mirro set up.
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