GasOne 50180 Refill Adapter for 1lb Propane Tanks & Fits 20lb Tanks, Black

Had the Black one years ago and it Worked fine a few times, no issues, then sold it. Years later then tried the Mr Hearer brand variety, and it always leaked one gust of propane out every time attaching it and required pliers, and the valve on my standard tank went bad and could no longer be refilled at the refilling stations, and I blame the Mr Heater brand one for breaking it. So I ordered a 2 pack of the red ones this time, 1 looked a little scuffed up in the threads as if it was used, and the other 1 looked fine so I used it, and on the first fill it worked perfectly, nice and full fill, no pliers, no leaks, no issues. Excellent device, I only needed 1 anyway and the 2 pack was the price of 1 anyway. I like how it does not insert inside the standard tank like the Mr Heater ones do. In the past I remember the black one did not fill my green bottles very well, and the Mr heater one did better in that regard, but this new two pack of red ones I got, they filled the green bottle I filled just as full as the Mr heater brand one was able to get them. Without doing any funny business techniques you hear/read about, they get about 2/3 full. I have tried putting the green bottles in the freezer 30 minutes prior to refilling them and it helps a little more go in, but not enough to go to the trouble. I would estimate you only get maybe an extra 1/6 fill by putting them in the freezer. I mean, if you're already leaving your standard tank out in the sun heating up anyway it's the same deal, as long as your green bottles are in the shade.

This thing works very well for refilling the small green propane tanks. If you’re tired of spending $3 per small can to run a heater or grill, buy this and save your money. It’s small, so put a rope around it or keep it in a toolbox so you don’t lose it and have to order another one like I did.

High quality and works great.Here's the science, without math. When a tank is half full, half the contents are liquid (LP=liquid propane) and half are gas. The liquid turns to gas until a certain gas pressure is reached inside, equalibrium. Opening the valve lets gas out, reducing pressure in the tank causing more fuel to turn from liquid to gas as fast as you use it. When you burn all the fuel, the gas pressure inside becomes that of air, well below that of a tank still having liquid inside.An empty little tank will partially fill from an upside down big tank, because the little tank's gas pressure is lower than the big tank's pressure. But, as soon as some liquid gets into the small tank, it starts to turn to gas because the little tank's pressure is low.For all gases, PV=nRT where nR is a constant and thus Pressure times Volume is proportional to Temperature. When you put your little tank in the freezer, you lower the temperature without changing the volume (i.e tank size) so the pressure must go down. If the small tank was empty to start with, the pressure was already low, that of air, and now it becomes less than air. If the little tank wasn't quite empty, its pressure starts high and goes down some, but not as much as if it were empty.Connecting the big tank to the little tank, you want the little tank to have as little pressure as possible. It is thus best if it emptied and then chilled.The big tank's liquid is at the bottom when it is inverted. The big tank pressure is higher than the empty and/or cold small tank, so liquid goes from the big to small until both tanks are at the same gas pressure. The little tank's pressure goes up as liquid transferred to it turns to gas while the volume for that gas is being reduced by the entering liquid's volume. Because it is chilled, that pressure is not as high as in the big tank. At some point, the little tank's pressure reaches the big tank pressure and liquid stops transferring.With regards to overfilling a small tank, the physics seem to indicate that is not possible, but there's a catch, so keep reading. Here's what might be happening. The small tank is chilled and then mostly filled with liquid, leaving just a bit of space for the non-liquid gas. The two tanks are equal pressure so the small one is fully pressurized. It gets disconnected and then starts to warm up. Remember, PV=nRT. With the volume constant, when the temperature goes up, the pressure must go up. Since it was at full pressure when it was cold, it is now over pressurized and thus could cause tank bulging. Without doing the math, it's not clear how much overpressurization will occur. There are a lot of variables here, like how hot was the liquid from the big tank and how long filling took and how much warming of the small tank occurred during filling.Some reviewers suggest poking the valve with an Allen wrench to let the gas out to fill with more liquid. It will reduce pressure temporarily or overpressurization as it warms. After you poke it you need to quickly reattach it.Now, back to the catch about overfilling. If your stove runs with the tank not fully upright but the tank is 99% full, what will come out? Liquid. Will it turn to gas before it gets to the burner and what will happen if it doesn't? I don't know and don't want to find out firsthand. Best to use the scale and let some out if you've overdone it.

Used once since purchasing! It meet all our needs, size, easy to clean. We cooked hamburgers for a family of five. It sustained the burgers nicely big enough, the heat was controllable! Clean up pretty easy for grilling! I am a female senior and I was worried I wouldn’t be able to lift or carry by myself, I was able to do both without much strain.It was perfect for the beach BBQ FOR FAMILY!

All you have to do is screw the bigger side onto your 15-20lb tank, screw on a small green 1lb bottle, turn the bigger tank upside down, give it about 15-30 seconds & then open the big tank valve.When the hissing stops completely - it’s full. Close the big tank valve, turn over the big tank & unscrew the small tank.Notes:-Have your 1lb tank in your food freezer for 10-20min before beginning this process. Propane likes to move from warm to COLD environments.-as you unscrew the little tank, use 2 hands. 1 on the tank, 1 on the adapter(to hold it steady from turning). After you’ve got the little tank unscrewed about 2-3 rounds, remove your hand off the adapter because freezing propane will shoot out that direction as the disconnection is made.-always place your plastic caps back onto the little tanks. Those caps don’t keep the gas in, but rather protect the threads of those bottles.-i prop my 15-20lb tank upside down before even screwing on the little tank. It gives it plenty of time for the liquid to move to the bottom.-if you finish filling a little 1lb tank, have it unscrewed & hear it hissing a tiny bit, place your thumb over the opening for a couple seconds to see if it’s just a valve reset or if it’s defective. If you remove your thumb & the hissing continues - set that 1lb somewhere far away from your house doors & windows outside. That 1lb tank is now unusable by us(the non-professional).Anyhow. Cool adapter that really saves a LOT of money in the wintertime.