![small helium tank small helium tank](https://www.kidsfairyland.com/sites/default/files/photos-products/PROT-009.jpg)
Sorry for going on like this but I get tired of "fear mongers" with their FUD. (If someone was to do the math they would probably find that there is not enough energy in this cylinder at 125 PSI to bend the "thin metal. What is the pressure in those cylinders? 3000 to 4500 PSI! Over 20 times the pressure! What does it look like when a 125 PSI cylinder is shot? You will not see a video on this, because it is boring! Most failures will be rust induced which will usually be so slow that you will not even notice. Thus proving that a leaking helium cylinder can be fatal) Ones point to the YouTube videos (and the shop teachers scare tactics) that show a high pressure cylinder being shot at. (on a side note, it is frightening to me that a common use of these helium cylinders is DIY suicide. How much pressure do they contain, sitting in the aisle at Walmart and bouncing around in the hot car on the way home/to a party? Approx 250 PSI! To refill one with compressed air at 125 PSI and keep stored in a safe place seems very reasonable to me. As far as these "Balloon Time" cylinders. It may be another thing if something went horribly wrong on the way and the insurance company hired a lawyer or two. It has been explained to me that it is perfectly legal for me to take a refilled cylinder in my vehicle. When I bring groceries home or take my gear on a camping trip I am not engaging in "Transport". However, what does transport mean? This means moving, usually in large quantity, from one place to another, for someone else, for a price. It is true that it is illegal to "Transport" refilled cylinders. I am also thinking of filling it with CO2 (only about 60 PSI) and using it to push beer out of a keg.
![small helium tank small helium tank](https://sc01.alicdn.com/kf/HTB1.0tgXODxK1RjSsphq6zHrpXag/Small-Helium-Tank-Disposable-Helium-Cylinder-Helium.jpg)
I found that it it turned the tank upside down and gradually increased the pressure the "cone" would not get pressed into place. I was thinking of just drilling it al well, but this would then not allow it to be shut off. Even with the handle turned open, it will fall over the hole and the refill pressure with keep it closed and prevent it from filling.
![small helium tank small helium tank](https://newlistingbucket.s3.amazonaws.com/e6/bc2e90a8a611e896be1fb30809c4f1/HEUM-TANK-DETAIL-_2_.jpg)
Found there is a combination shut off/anti-refill cone that is pushed down by the turn handle. (kind of limits the pressure a bit) and a compressed air disconnect. I just did one and used a reinforced PVC toilet hose.