The lid locks on very securely and the built in safety valve along with the pressure lock makes it very safe.

The last time, the bottom screw on the air vent/cover lock jiggled itself loose and fell off while under 11 lbs of pressure.

The vent lock simply would not activate,and the Pressure gauge was incomplete (missing small gasket).This is obviously too late for any kind of return ,so I am just stuck with an overpriced aluminum pot!!I have videos and pictures showing the steam and all water escaping from the vent lock,but never building pressure

However, even though the vent locks, it began to leak steam in my last batch.

On my first try,the seal and vent/lock would not activate