LAUNDRY! There is (hot-cold) water everywhere in the two story (3/3) five years old duplex in Florida (with no freezing pipes or temperatures) but in the laundry room. Everything looks new and was properly checked including valves at the water heater. Outside meter replaced and pressure reducer valve checked and readjusted. Faucets OK. When the cold line is back flushed with neighbor's water supply (after cutting off my main line), water is not coming from the outside spigots but from the hot line in the same laundry room, and vice-versa. Plumber was unable to solve the problem after cutting the walls, leaving a major mess, and charge 350 dollars for it. He wanted to do a major surgical “bypass” by bringing water from another unknown point in the house and charge an extra 500 bucks :furious:. PLEASE HELP! It must be a logical reason for this puzzling problem and somebody must have an intelligent solution for it. Or it is a dead end?