I WILL GUESS THAT IF YOU COULD GET THEM to accept a valve you will be hard pressed to find a shop that will fill them. if you have access to a private compressor that is another story. I would not use them for scuba but they may be ok for your car suspension if you are into that. I would bet that these modified tanks will be the talk of the day at your hydro shop. I will not continue with the obvious as i have probbably already deviated too far from the op.s ?
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Ya might want to reread the post, Wookie said to rework the VALVE not the tank so a hydro shop would be looking at a standard, unmodified tank, exactly like dozens of others they see every day. Still, reworking the valve would not be cost effective. That said, IF he can find a standard scuba valve, there is no reason at all for these not to be put back into scuba service. The biggest issue I see is making sure some nutjob on the fill whip gets the fill pressure right.