So I have a National 7 that I bought used. I've replaced the gauge (even tested the gauge) and the seal, but for the life of me, I cannot find this rubber cap in the very back. It is cracked and immediately lets out air through the middle when the pressure starts. I know it's for safety, but if anyone knows a replacement, I would love to know.
by boxed_crow
1 Comment
Try [here](https://www.cookingandcanning.net/nationalold7.html) and see if it looks correct.