[tseres]

ya, unless you want to use larger tube throughout your entire air system, series is fine. as stated above, if there is any leak, the entire system is done for. with series tanks, all the pressure flows through the same 1/4" tubing. With parallel, you would have the same pressure, but twice the volume flowing through the same narrow tubing.

i'm probably wrong, but my point is that you shouldn't worry about it. with our robot, we just connected the tanks up before the pressure regulator. one tank just flowed into another. it worked fine. forget the series and parellel. just connect them in whatever order you want...the point is that it's still going to hold the same volume of air anyways. besides, like stated above, you'd need a 2 pressure regulators (at least) before the parallel air could make it to the pleumatics.