Application: Filling gas cylinder accessories, compatible with PCP air guns, air guns, Foster paintball, paintball cans, SCBA cans filling, etc. When used with two filling adapters, a male-to-male curing unit allows you to move air from one tank to another This can be helpful if you are trying to transfer air from a large bottle to a smaller portable bottle. Simply connect each filling adapter to the male-to-male culture connector This is also helpful if you are filling an SCBA tank, but the person trying to fill the tank does not have an SCBA filling adapter connected to your bottle In this case, you can ask them if they can use paintball gun accessories for refueling. Then simply connect the male-to-male filling adapter to the end of the filling adapter (if the rated pressure is 4500 psi), and then connect them to the filling container., Manufacturer: BagLEv