<VUR10> allows 3rd party solenoids, but there does not appear to be a legal way of powering solenoids other than the vex solenoid driver cable.
<VUR10> Teams may utilize commercially available pneumatic components from the following list: Cylinders, actuators, valves, gauges, storage tanks, regulators, manifolds, and solenoids.
The VEX solenoid driver cable is only compatible with a small number of 5V SMC solenoids, but most solenoids follow a standard 12V or 24V. Is it legal to power other solenoids with other electronics?