@cn90; you just didn't see it when failed: the plastic deforms over time, one side opens up enough for the o-ring to squeeze out. True with a fatter o-ring that might not happen but only one of the clips holding the joint together does anything. I reassembled mine without the zip tie and it was immediately twisted which is why I added the zip tie. The zip tie keeps the joint perfectly straight. I clearly had more hours on mine and wife's siphon jet than you did.

If somebody catches this before failure all they need to do is add the zip tie and it will prevent the o-ring from popping out even with the thinner stock o-ring.

Great write up I'll mention again. ∞ more detailed than mine. I think I already edited my thread to say "go over there to the better thread"

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)