The Reagent Store (also shown mounted to the Heater/Cooler) fits (in a fluidic sense) between the pumps and the reactor.

It contains 4 independent manual valves with accompanying PTFE sample loops and Luer injection ports.  This allows reagents (or solvents) to be added in-line, rather than having to be pumped through the syringes.  In this mode, “buffer solvents” from the Reagent Pumps push the reagents/solvents out of the sample loops and into the chips.