We have this solenoid valve that is controlled by air rather than electricity. Its kind of hard to explain. It looks exactly like a normal double acting solenoid valve except it has two more holes for the air to control the valve.
The reason we decided to use a air controlled valve rather than an electrically controlled one was because the airflow was very restricted with our original solenoids. The problem is the air controlled valve is huge. It has output holes at 3/8" diameter. We're not sure if this is legal.
Below I've attached a picture of the box it came in. One of the teachers took it with him to find connectors for it. Any suggestion as to whether this is legal or not is appreciated.
