Review on Baomain 4V210-08 DC 12V Pneumatic Air Control Solenoid Valve - Internally Piloted, Single Electrical Control, 5 Way 2 Position PT1/4 by Tim Kallimanis

** Update **I was back at it again this year building a bigger and better device to scare innocent trick-or-treaters. I purchased 4 more of these. One thing that I hadn't thought about was the 3 Watt power usage. I had originally used a 12v 3A power supply to run everything, including a 12v -> 5v power converter to power my Raspberry Pi. But with 4 of these + my Raspberry Pi I was actually getting something like a brown out on my Pi. If I only activated two or three at a time it was OK, but if I activated all four then the Pi would freak out for a few seconds, the program would die, and power would return. Just make sure you have enough power to cover how ever many watt's you are using.** Original **P is your pressure source.A and B are your outputs. HOLD the red button to switch from to B for testing. The other two ports are your exhaust ports, used during switchover.I used this to build a Halloween Scare machine, oscillating air cylinders that smack into the underside of my deck. Works great. I feed it 12 volts through a relay board hooked to my Raspberry Pi.