adding expansion tank

[WillyB]

I am thinking of installing an expansion tank to my water supply. Do I need a check valve to stop the pressure bleeding off, or does the pump have one built in? Any thoughts appreciated.

[NWJeeper]

The tank only need be installed somewhere after the water pump in the system. It's sort of like an air tank on a compressed air system in a way. See this diagram which may help you visualize it. There is also this page which is very good at explaining RV water systems.

[WillyB]

NWJEEPER. The water everywhere article covers everything I wondered about, and then some. It is definitely worth saving for future use. Many thanks!