[Wally Arntzen]

Richard, I'm surprised to hear that yours will not work unless you have 120 pounds of air. Mine goes in or out on as little as 60 pounds. Maybe your air switch is cloged up or something. I replaced the air switch in the fan bay that acativates the cylinder for pushing out or pulling in. I don't remember what I paid for the switch but I replaced all of mine and they were a little pricey if I recall right. I think there three of them, one for the generator, one for the step cover at the door and one for the air dump valve on the sewer dump gate valve.