Back bottle adapters?
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I have them for 1/2 that...
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idk about that much. They are a little uncommon on the market, although I suspect plenty of caches in AO closets. That one is in nice condition.
They are best with a 7 or 9 oz bottle, so I haven't seen many around besides mine. They are really nasty on o-rings, too. The threads are very sharp, the pin is long, and they have no vent hole. On mine I have ground off the tips of the threads, ground down the pin, and drilled a vent hole. That saves the o-rings most of the time, but one still cuts some after the o-ring has swollen a little.
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