[BB_TX]

It has often been said that the reason for the red regulator is that without it the line pressure in the cross over pipe would be the same as the tank pressure. And since under tank pressure the propane in the tank is in a liquid state, it would theoretically be possible that the propane in the cross over pipe could condense back into a liquid state when flow stopped. And I suppose it could then possibly go into the two stage auto change over regulator as a liquid the next time flow started. An assumption only a real propane guru could verify.

People have eliminated them thinking they serve no real purpose. And apparently with no problem. I am not ready to go that far.