This item requires an Air Compressor. Not included!
They work fine in cold weather but freezing could be an issue. Compressing air creates moisture which can get into the valves. If this happens and conditions are below freezing then the water will freeze and the valve will not function.
This valve requires at least 20 psi to operate.
Yes, see this document on how to do so.
Air only, 20psi minimum.
No, because with a 4-way air is always coming out of one of the two ports. Here is some info on how these vales operate: /faq/content/2/51/en/solenoid-valves-the-different-types-explained.html