This is the OEM, VW factory tool for servicing all VW/Audi DSG transmissions. This tool does not use a pump but has an extra-long tube for gravity-filling. Thread the transmission adapter into the transmission and, at the other end, attach a DSG fluid bottle. Then hold the bottle up in the air, above the transmission, open the valve and the fluid will flow into the transmission.
For the same price (or less) you can get easier to use, pumping style fill tools as well. Search "fill tool" in the search box above to see our other options.