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ive never tested this but i read somewhere that if the screws that go into the reg are hexagonal its HP and if they are round its LP, but im not sure.
also if its a crossfire tank the regulator will have a red base for HP and blue for LP.
and its not gonna be written on the tank, as companies buy the tanks from other companies and put their own regs on em, if its written it will be on the regulator.
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