From what little i can see, it looks like it may be a “decanting machine” ie a device that sfaely pumps liquid from a large container ( ie gallon jug of ale) to a much smaller vessel ( ie half pint glass” .
With such a rig, it is not only sanitary ( if kept washed) but also alleviates spillage and messes when trying to pout form a multigallon jug! ( ask me how I know lol)
Yhs
Prof marvel