The Valve Cap is screwed onto the valve stem. The installation process requires to screw the cap down firmly in order to set it correctly.
The center spring has pushed open the valve and the tire pressure flows into the Valve Cap and into the reference chamber.
The Valve Cap is firmly screwed down on the valve stem.
The top of the valve stem and the seal in the Valve Cap has made an airtight connection.
The mouth of the pressure/reference chamber is permanently sealed with the tire pressure trapped inside the chamber. The one way nut below the chamber seal will keep the chamber seal in place and airtight.
The Valve Cap is now in its regular state where it monitors the tire pressure all the time without using any energy from the batteries.
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