agentbud
Well-Known Member
I have a 20lb CO2 tank and a transfer hose that I use to refill my 5lb CO2 bottles with. Works great. But I got to wondering. How does it know to move the CO2 from one bottle to the other. I assume that when the 20lb bottle is full, the pressure is enough to force the CO2 into the empty 5lb bottle. But what about when the 20lb tank is getting low, for example only has about 1lb of CO2 remaining. It seems that once it transferred half of that and each tank then has .5lb, it would equalize and not transfer the rest. What causes it to transfer the whole 1lb? Or does it? I have heard that getting the 20lb tank warm and the 5lb tank cold helps with the transfer but what if both tanks were the same temp, would it still transfer the entirety of the CO2?