At yard sales, many times I can buy a propane tank for $1-$3 (the=at is my cap price) and I post on marketplace and craigslist for $10. They never last very long. Many times, there is still some propane in the tank that can be used before the sale of the tank. Sometimes there is enough to sell as a partially full or full tank. This is a little tricky because the average person has no idea how to tell if the tank is full or not. The way this can be shown to someone is to weigh the tank and get the weight, subtract the tank weight that is marked on the tank and you will have the weight of the liquid propane inside. The tank is full with 20#.
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