Yeah it’s seems to be something else. And oh is it bugging me now when I don’t know.

Mine seemed to be 6 cup version. It holds about 300ml of water and the gasket was 71ml in diameter :)

Filling it to the safety valve it holds little over 300ml of water. Filling it to the brim it will hold about 440ml of water.

Edit: 6 cup version seems to be 300ml in size not 250ml. Also the diameter of the rubber matches.

I’m still confused what the stamp means, even though it doesn’t matter.

I will try this. Do you fill it up to the safety valve or to the top?

You already have it. Try?