That looks like it could be the fresh water manifold if the front has valves to direct the water (city, winterize, pump) and a water heater bypass. Looks like it might be the old style plastic and not the all brass version Vanleigh switch to in later model years.
I recently replaced mine due to a busted valve handle. Details in this thread Broken water heater bypass valve. The manufacturer Anderson Brass Co, might have a replacement option for you if you follow the links for them in that thread.