it does not matter (left or right) it will automatically change over just make sure BOTH tanks are open,the purpose of the lever for each tank is if you DO NOT want it to change over and isolate one tank like me because I do not want the situation to happen where I am Totally out of Propane and have to get them filled up,when one goes empty I open the valve to the other tank then I manually change the lever to the full tank and go fill the empty when I get a chance
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