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The silicone seal might peel off the shaft. That's how the HN's come apart, pretty easy.

So there must actually be a spring inside. Wish I could touch one. ...and take it apart like this horizontal nipple:

So it's still gravity just with a softer material to seal.

The description in this link is suspect "releasing a small amount of water onto the lower lip of the nipple" there is no lower lip on these vertical nipples.

The spring is made of silicone....or the seal gasket??