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Just did a quick search on OPD valves and found they are specific to tank size and the OPD valve number is stamped on the tank. (very highly regulated) If a refiller is only providing 15 lbs I would think it is a scale shutoff and not the OPD valve stopping the flow.
I learned something today, my local refiller stopped using the scale and the meter stopped at the appropriate number. Now I know why. I always take in empty tanks.
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