The camp has two separate propane systems. Each system consists of a pair of 20-pound tanks connected to a single valve. The system on the left supplies the refrigerator:

The system on the right supplies the stove and the lamps:

Switching tanks

Each valve has a pressure indicator. When the indicator shows red, you must switch the supply from one tank to the other, as follows:

Close the empty tank by turning the knob on its top.
Turn the valve 180 degrees so that the system draws from the other tank.
Open the other tank by turning the knob on its top.

After switching tanks, you will need to restart the refrigerator or the stove, as applicable.

Replacing tanks

If you have an empty tank attached to a propane system, it’s a good idea to replace it with a full tank at the first opportunity. That way, you won’t be caught short when the second tank empties.

To replace a tank:

Bring the replacement tank to the propane system.
Disconnect the empty tank from the system by gently unscrewing the green plastic seal from the empty tank. Inside the green plastic seal is the nozzle that connects to the propane tank; cover this with a finger or thumb until you connect the replacement tank. (Propane is heavier than air. Therefore, if you don’t do this, you may lose pressure in the system as the gas drawn from the other tank runs down the hose and out this nozzle.)
Move the empty tank away from the system and put the replacement tank in its place.
Connect the replacement tank to the system by gently screwing the green plastic seal onto the replacement tank. Do not over-tighten the seal; it may crack.

Always leave two tanks connected to each propane system, and be certain that the any tank that is attached to a system but not in use remains closed, whether it is empty or full. (If you don’t do this, you may lose pressure in the system as the gas drawn from the other tank runs down a disconnected hose – or down the hose to an empty, but open, tank.)

You can return empty propane tanks to, and purchase replacement tanks from, most local grocery stores and gas stations.

Troubleshooting

On occasion, propane will not draw from a full tank through the regulator and into the pipes. This may indicate a blockage in the pigtail (the flexible hose that connects the tank to the regulator assembly) or in the regulator itself. It may be possible to clear a blockage by disconnecting the pigtail from the tank and blowing compressed air into the pigtail.