City Water? Water Tank?

[Auggie56]

What keeps the city water out of the onboard water storage tank? The two don't mix do they? Check valve at the water pump?

Thanks

[Old-Biscuit]

Correct......
Pump has an Internal Check Valve (diaphragm) that stops backflow thru pump when using city water source.'

City Water Inlet also has an internal check valve that stops flow thru inlet assembly when using on-board pump

Course if you have a 'wet bay' with a FILL Valve it can also leak thereby flowing water into fresh water tank when using city water source.