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A water shut-off valve should be installed on the incoming water line in a convenient location (Use a low restriction type valve, such as a 1/4-turn ball valve, to avoid loss of water flow thru the valve. 5. NSF requires that the brewer be able to be moved for cleaning underneath. A flex line or loops of copper tubing will satisfy this requirement. 6. In some areas, local codes require a backflow preventer (check valve) to be installed on the inlet water line. If a back flow preventer is used, y