[Al Skierkiewicz]

R66
B. Solenoid valves with a maximum ⅛” NPT port diameter, and a maximum Cv of 0.32 (if non-KOP valves are used, the team will be required to provide part documentation validating that the valves meet these constraints).
J. Pneumatic cylinders.
K. Pneumatic storage tanks.

There is no limit on solenoid valves, actuators or storage tanks as long as all of the other rules are met and you do not exceed your budget, bank account, or spending limit of $3500 USD.