Buffers are machines used in the RedPower mod in conjunction with Pneumatic Tubes. Buffers operate like Storage Chests, but with a slightly more complicated internal inventory system. Each of the Buffer's five input sides has its own designated section of the Buffer's internal Inventory: one of the five columns of slots.
The Output face of the buffer sees the entire inventory as a whole, and draws from all of the input inventories equally when connected to a Pneumatic System. This is very useful in combination with a Sorting Machine A common application for this block is in situations where different inputs provide their materials at different rates. A regular chest could easily be filled up by stacks of single items, leaving no space for other resources.
RedPower Buffers can NOT accept items from Pneumatic Tubes and then output into Buildcraft pipes. For that you will need the TubeStuff Buffer.