I'm betting buying the whole piece on Amazon will be cheaper than just the bowl from Newmar.
Also check the check valve in your fresh water hose connection. It can get debris stuck in the valve and cause it to draw air into the system, when using the pump. A way to check it, is to screw a cap into the hose fitting, to seal it.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor