R QIDI TECHNOLOGY Filament Dryer Box, 3D Printer Filament Storage, 1.75mm Compatible, Black, 1kg

Does anyone know the size of the quick release used on these dry boxes?

The small black plug in the metal fitting is two parts, a rod inserted into ring. Safely remove rod w/pliers? It's stuck.

How do you recharge the dry pack?

Do you have to buy replacement dry packs? If so where do you buy them I can’t find them