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Is the on/off valve HUGE?
If so, then its a thermal-valve. Thats what people used for Tippmann invented the pin-valve we all use today.
Some fields won't fill them because the ASA is a little different. Most thermal-valves did not have an oring on the threads. It was on the ASA, so you would need to drop an 0ring into the fill station in order for it to work.
But.. how to know when its full? YOU NEED A SCALE.
If its a "10oz" tank, then weight it when its empty.
Then weigh it when its full. It should be about 10oz heavier. If its more, then dump a little out.
If you over fill the tank, there is a chance that it will blow the safety-valve. Or worse.
Good news is that those old tanks were small enought that they didn't need to be hydrotested. However, the fill-station probobly does.
Nick
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"the evidence strongly suggests that neither Billy nor Adam (Smart Parts) could have invented the electronic paintgun" -Garr M. King, U.S. Judge
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