Pressure canners are not to be messed with. If you have any suspicion about its functioning, relegate it to jelly-making only.
Pressure means pressure, with boiling water. Take no chances.
And get a canner big enough to be efficient for your needs. My friend put everything up in pints. If you want to use quarts, consider how many you’ll be processing at a time.
That will tell you what size container to use. Get a sturdy one. Either way, it will last a lifetime, but a cheap one could mean a short life.
I have always been suspicious of lifetime warranties. Isn’t that saying that they will honor the warrant as long as the devices works? And then it’s lifetime is up.