I have a dual mattress/dual control Comfortaire RV 750 king size bed installed in my 2009 Dutch Star. Both mattresses deflate the moment I lose 110VAC, but they hold air without leaking as long as the pump is powered by 110 volts.
I called Comfortaire support. They do not carry any pump parts. However they will be more than happy to sell me a brand new pump for $359, which is their "discounted" price.
I can't believe there isn't some sort of check valve in the pump that keeps the mattresses from deflating when the pump loses power. So, I am looking for repair ideas without having to buy a new $359 air pump.
2009 Newmar Dutch Star Model 4043
Welcome to the forum.
This link shows check valves for what you need from Comfortaire and others.
All the links below in my signature have information for your Newmar also.
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