The Fox shocks are very simple.
There are 2 wiper/lip seals in the end cap. One keeps the oil in, the other keeps dirt out.
There is a piston, bolted to the chrome shaft. It has a piston ring. I think its made of rulon. On each side of this piston is a stack of thin washers, one for compression and the other is rebound.
I don't recall, if there were any holes, in the piston, for drain back. At full droop, most all of the oil would be on top of the piston. The schrader valve side.
I think the Nitrogen gets dissolved into the oil, at high pressure. When we release it, it begins to bubble out of the oil, like it was boiling.
When I rebuilt my shocks, I could hear this boiling action happening. So I would let a little Nitrogen out and then wait, then a little more and so on. I was trying to save the oil, to measure it.
Yes, on the first shock, I caught most of the oil with my face. I don't recommend this.
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