I realize this isn’t UL, but that many of us use them for car camping, around the house and to refill butane/mix backpacking canisters. Anyway, I was in a farm-supply store in Cheyenne earlier this month and I always try to walk through those because they have an interesting array of items. One of them was a refillable, 1-pound propane cylinder.
Currently $11.31 on Amazon.
From what I can discern from their information and Amazon comments, it does not have an overfill protection device (like 5-gallon BBG cylinders do) but, while being filled in the vertical position, once it is full, it vents a foggy spray of liquid and vapor versus venting only vapor before its 80% full. That’s your signal to close the valve from your donor tank.
I don’t see anything it does for me that recycled “non-fillable” cylinders don’t. I write full and empty weights on every canister and cylinder I own and check weights before and after each fill. But if someone was new to refilling cylinders or just preferred the venting of liquid as the end signal (which is how the big cylinders are filled), maybe someone would want a few.
Like the “non-refillable” ones, you can fill it with $0.65 of bulk propane from your BBQ tank instead of buying new 1-pound cylinders for $3 to $7 each and contributing that pound of steel to the waste stream.
