[Land Yacht]

Thanks Russ, your explanation makes sense about the check Valve whistling, but I don't understand what my newly installed valve to close off (isolate) the passenger dump air release valve would redirect air to the wheel tank and cause the check valve to whistle.

Is it harmful to have that happen? When opening the valve to return to the way it was my valve is still leaking and my compressor runs every 22 minutes, with the valve closed, I get hours. Obviously, I need to replace the air dump valve but wondering about my workaround and its feasibility.