What I learned (the hard way on a long trip) is that the backflow preventer for the sprayer is made out of plastic, will blow apart if the water pressure is too high, and sits directly over the expensive ($230) 12 volt DC convertor/battery charger. It was also VERY difficult to access for repair. I replaced the plastic "atmospheric" breaker/check valve with a standard, metal, "Sharkbite" 1/2" PEX, check valve.