[Land Yacht]

Mike, the rectangular box looks like the air doubler. There should be a pressure regulator valve on it.

Would that be an adjustable pressure regulator valve? Not sure I understand the intent of the doubler, nor how to use the device?

Is a doubler merely for airing your tires or does it operate within the coach systems?

Do I just need to buy an air hose to hook to the outlet in the same compartment?

Sorry for being so ignorant on this one, air systems are all new to me as the only ones on my boat ran an air horn :-)