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I always leave both tanks open and when the crossover valve turns red I take the empty tank to get it filled. Using the crossover valve has always worked flawlessly for me and we have never ran out of propane. If I'm running into town and I think that I am running low, I do the lift test to see if it is worthwhile to take it for a refill.
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Lenny and Ros
2012 Montana 3400RL,680 Watts Solar,4xT-105 Trojans,GP-ISW2000-12 Inverter,Trimetric 2020, EMSHW50C
2009 Chevy Silverado 3500 LTZ Duramax 4x4 CC Dually, Banks Speed Brake
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