I had my Drager Dolphin (Steel Faber) 4L Steel tank hydro tested and the hydro tester would not give it a plus rating because he could not find the REE number stamped on the tank. The tank was plus rated from the factory and then it was plus rated one other time from another hydro test facility. Can anyone tell me how I can find the REE number for this tank that was manufactured in Italy by Faber and has a USA DOT number?

Thanks in advance.

John J. Malcolm