Transfer adapter for filling small paintball tanks from a master tank. This simple adapter allows for efficient transfers of CO2 from master tanks to smaller tanks. Record an empty weight and calculate full weight by adding tanks rated capacity. Squirt a little CO2 out to clear debris and fill syphon. Screw the adapters brass side onto a Standard CO2 tank valve(CGA 320). Screw the small tank into the blued steel side and open the small tanks valve if fitted with an On/Off valve. Invert master tank or siphon feed CO2 with valve open for a few seconds. Shut master tank valve and back brass nut off letting small tank bleed down slowly. When you notice frost on tank bottom stop the bleed by tightening brass nut to master. Transfer a second time. As soon as you see the frosty outside change to wet, stop the fill and close the valves of both tanks. Don't over-bleed as it creates overfills & blown burst discs. These procedures are for filling tanks which are both starting at the same temperature. In the fridge with the produce and milk over night or 20 minutes in most freezers is about how long it takes to chill a tank as much as you need to get a full fill. That is another option if you don't want to waste CO2. Weigh the tank before it reaches room temperature and remove any excess CO2 by bleeding down or filling guns. Vessels maximum rated capacity is a lot less than it will actually contain. Do not exceed rated capacity as it can do damage to the Burst Disc and possibly give more pressure to your gun that it appreciates. Be safe. When making CO2 or Air Transfers as well as shooting use appropriate eye and ear protection at all times.