An essentia buffer is an alchemical component used to help store and sort essentia in passage.
A buffer can hold up to 8 points of essentia, in any combination of aspects. By default, they have 0 suction themselves. They can pass essentia to any matching or untyped suction, but do not transmit the suction to their other connections. If a buffer is broken, any essentia in it is silently lost.
However, one or more bellows can be attached to them, each of which adds 32 suction. They have 6 attachment points, each of which can be used for a bellows, or a connection to another component. each bellows block can be individually turned off by applying redstone power.
If a buffer has bellows attached to it, any (other) connections can be configured by shift-right-clicking with a wand. The connection can be left as normal (full suction), marked "black" (0 suction), or marked 'red" (1 suction).