Over the weekend, I decided to make a gallon of starter wort and can it in my pressure cooker for future use. Everything was going fine until the pressure cooker heated up and started leaking steam out of the overpressure relief plug. Having never paid much attention to the plug, I assumed that pushing down on it with an oven mitt on might seal it. What I didn't understand was that it is just a rubber plug that is inserted from the underside of the lid. So, when I pushed down on it, the plug fell into the pressure cooker with a blast of steam erupting from the now open hole in the lid. Obviously, I had to shut off the heat immediately.
Not wanting to waste a gallon of wort waiting to be canned, I jumped on Amazon, found replacement plugs and paid extra for overnight delivery first thing the following morning. Based on some quick Google research, it appeared that everything should be okay as long as I canned the jars within 24 hours of my first attempt.
The next morning, my Amazon shipment did not arrive. Now what? I then realized from my Amazon order that the overpressure plugs are just rubber plugs. So how could the original plug have failed in the first place?
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It then dawned on me that by pushing down on the original plug I probably pushed it out of the hole, and it was probably sitting inside the pressure cooker intact. It was! I simply pushed it back into the lid from the underside and proceeded to can the wort without issue. Of course, the new plugs were delivered shortly after I finished canning the wort. I now have 4 replacement overpressure plugs that I will never need or will probably lose before I need one.