Festo don't do valves that work direct from the receiver - only manua valves - which would require a servo - or solenoid valves that will require some extra electronics - I think the one you saw in the mag is just the manual 4mm valve.

However Xicoy do do some valves that will work direct from your RC system - you can see them here: http://www.xicoy.com/catalog/index.php?cPath=35_37