How do carbon dioxide (CO2) and oxygen (O) escape the airlock?
Image Airlock Cover The airlock’s snap-on plastic cover has 8 small air holes drilled around its perimeter, through which O and CO2 escape. After filling the airlock with approximately 1 1/2 T of water, and then dropping in the center valve, please snap on the airlock’s plastic cover- it plays an important role in the airlock’s functioning – the airlock allows oxygen and excess carbon dioxide a way to escape, as well as keeping oxygen out of the Pickl-it.