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Where you found the shower connections is the correct area. Look around a little and you should also find 2 plastic lines coming up from below with a brass fitting in between them. That is the back flow preventer. May be as simple as tightening the fittings. Good luck.
The knuckle draggers will be along shortly to tell you to delete the back flow device. DO NOT LISTEN TO THEM> It is there for your, and the rest of the public water users, safety. Not very expensive and easy to change.
You did say grey water, so you will find 2 devices. One for the black tank and one for grey.
Bill
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