Spare Air Scuba Tank Refill Adapter 910S - Portable Diving Air Cylinder Refilling Kit for Emergency & Recreational Scuba Diving Gear - Perfect for Underwater Adventures, Boat Trips & Dive Training

It does work but it has two issues:1) it is overpriced but there are little alternative.2) the device is not as strong as expected despite its heavy weight. The item arrived with a chip on the threaded tip end, limiting its use. I had to get it repaired just out of the box.After all the bad beginning, the adapter is working fine.