[MrForbes]

Good point Jason.

The metal one runs on 24v. you connect the wires from one end momentarily to power, it will light up the light on that side, and shift the valve (if it was not already that direction). Then try momentarily connecting the wires from the other end to power. It should momentarily light the light and shift the valve to the other side, making the cylinder move to the other ends of it's travel and stay there.

The plastic one runs on 12v. It works differently, it will make the cylinder move and stay at the other end of it's travel while you have power applied to the solenoid, then it will move back when you remove power from it.