Not entirely sure why you would want to? You can just pipe the metals into a casting table or basin to make things. And if you want to use the metals to make new alloys you probably want the control of adding it in proper quantities of ingots/blocks.
The facing of the drain doesn't really matter- as far as I know, it's just aesthetic. You should be able to pump liquids into any side of it just fine.the metal can be stored in tanks for later casting if you wish, or if you wish to alloy it with something you can pump it into an upward facing drain last i checked
And ... one ingot for the Tinkers Knapsack, if that floats your boat!There are other uses for aluminum brass, although I can't remember which mods or if they are updated and still on packs. There was one mod that used the blank templates you can cast in an empty casting table to make wire to put on spools for one.
You can also use blocks of aluminum brass for your tool forge instead of iron. Actually any metal can be used although I've not seen a Twitch channel/YouTube video that seemed to know about that... I use the ore I have the most of when I'm ready to make my Tool Forge, usually aluminum.
if you use the enderIO fluid ducts you can pull out partials.. if you are creative you can use Item and fluid duct to pull out your metal and flip a lever to pull partials back into the smelter.
It occurs to me that mariculture has a "ladle" that might be ideal for this as well. You can scoop out minute amounts of molten metals just by right-clicking the basin or whatever its currently sitting in. Untested and possibly unrelated (requires Mariculture mod)if you use the enderIO fluid ducts you can pull out partials.. if you are creative you can use Item and fluid duct to pull out your metal and flip a lever to pull partials back into the smelter.