You can choose a specific side to interact with through the tank in the world, as well as a specific fluid in that tank
Another example of transferring a fluid
You can specify an exact amount in milibuckets to transfer, and the direction of the transfer
You can transfer fluids or gasses between two items in an inventory. Handy for filling a large quantity of buckets, or easily collecting fluids into a single item!
Support is for transporting Mekanism Gasses is optionally available