Oh dear...
Edit: I can see all the influences, shockwave is on the bottom of the tube with the steps and the venting, simplicity with the locking mechanism, and the ELA hybrid post. It's hard to gauge but it looks like it's maybe 26xxx?
I'm still amazed that this needs to be done. I'm sure most people would agree that water sucked up through a straw behaves completely different from water blown out of a straw.
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