The SOURCE Tactical UTA is used to fill your hydration bladder without removing the bladder from the pack. You remove the bite piece from your hydration hose, attach the small end of the UTA, then attach the large end to your water source. Turn the water on and the bladder starts filling. You can attach this to water bottles, hoses, faucets, and plenty of other water sources. It’s a handy piece of gear that’s light and easy to stash away in a ruck.