Ok, just called Powertank. That brass fitting is actually a seal (it has an O ring on it), and is the old way of sealing the regulator to the tank. It's not required, nor is it a "restrictor." If the regulator itself has an internal O ring, then this brass fitting is not needed.
The best part of this is old age. I took the fitting out and put it in a safe place so I wouldn't lose it. Now I can't remember where I put it - that was only 2 weeks ago!
"The most unreliable car in the world is the most reliable car in the world." -Jeremy Clarkson refering to the Range Rover
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