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Second shot at unleashing Vulture 1

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For the other end of the oxygen tube, we inserted a bog-standard bicycle valve into the bung, and fixed it with rubber glue:

Bicycle valve glued into rubber bung

Here's how we attached the bung to the oxygen tube - with steel wire. Note that we rejected our first idea of using worm drive hose clips, because they wouldn't fit inside the PVC tube.

The bicycle valve bung attacked to the oxygen tube

Here's the same passing through the PVC end cap. This differs slightly from our concept graphic, which shows the entire bung protruding from the PVC tube:

The bicycle valve passing through the PVC tube end cap

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