[terry and jo]

Thanks for the replies, Guys. Since you've mentioned an "upper" check valve, I am presuming that there is also a "lower" check valve. Now, could you clue me in to where each of those would be located in a coach with a side bathroom?

I certainly hope it isn't in where the fittings are for the shower itself. That location has to be reached via a small access panel that is actually inside a cabinet in the bedroom. Please tell me it is elsewhere.

Terry