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I just finished checking mine. I lit the furnace, checked to see which tank it was drawing out of, and turned the valve off on that tank. The automatic switchover valve ( for lack of knowing proper name ), switched tanks, the green indicator turned red, and the furnace never faltered. I turned the indicator lever the opposite direction and it instantly turned green. I then let the furnace run for several minutes to make sure it wasn't going to starve for fuel. I don't know if any of this is going to help answer your question, but it let me know my understanding of the system is correct. BTW, the port side tank on mine has a red regulator, and the starbord side has the gray regulator between the automatic switchover valve, and the appliances.
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