[cw3jason]

Just a side note: if you leave both tanks open, the valve will auto switch to the other tank so you don't run out of propane in the middle of the night and freeze. you will be able to tell when it switched by looking at your indicator. if it is red, the tank selected by the location of the lever is empty and you are running of the other tank. just move the lever to the good tank and it will turn green again. Then just turn off empty tank and remove for filling. Once full, re-install and open valve, this now becomes your reserve and when your primary tank is empty just reverse the process and repeat.