I am assuming that if you pressure cook empty
everything inside gets sterilized.

However in the TMC a possible cause of bacteria is stated as coming from the PCooker.

It then gives a solution of pressure cooking your pressure cooker for 24HRS!!

WTF????????

I would appreciate an explanation.....

Pressure "steralizers" create a vacume upon cooldown which needs to be realesed in front of a flow hood or in a "large" glove box so as not to admit unsteralized air to muck up agar plates.

Only Pressure "steralizers" like those made by All American create a vacume upon cooldown so that they can have their pressure realised under controled/ Filtered conditions.

A buddy has had fairly good luck by putting a alcohol soaked towel over the top and if necessary wrapped around the handel of a regular home type pressure cooker,,,he reported his worst case scenerieo has been to lose like 10 % to contams out of maybe 30 dishes.

He got lucky awhile back and had a deciest grandparent leave him a 21.QT Presto that locks with turn screws like an All American ,,but Vintage of the mid 40's ,,,the unit is in like mint new condition and makes up a nice batch of petri's which he realeases pressure in front of his flow hood and now doesent lose a single dish to contams.

God Bless Grandparents.
:-)