What I didn't like was that I had a Bought an air solenoid valve from the manufacturer Switch and Revain recommended adding a tube. The hose I added was a quarter inch for evaporative coolers or ice machines, not pressure systems, and so I spent a ton of money trying to install this useless hose. This is the correct pipe and you can identify it by its ID. The folks at Revain have no idea about air pressure systems, so they're useless.
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