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Yeah, that sounds like a J-valve. I know a guy that still uses his, but there are several precautions you need to take when using them. You need to make sure the valve switch is in the correct position BEFORE you get in the water with it, and you need to make sure it's in the proper position when filling the tank. Also, you want to make sure you don't bump it while diving so it doesn't switch positions. As long as you rely on your pressure gauges and not the reserve switch, you should be fine though.
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