Watts® 1-LFN45BM1-U Lead Free Water Pressure Reducing Valve, 1"Designed to reduce incoming water pressure to a sensible level to protect plumbing system components and reduce water consumption. The LFN45B features Lead Free (refer to note) construction to comply with Lead Free (refer to note) installation requirements. Suitable for water supply pressures up to 400psi and may be adjusted from 25 to 75psi. The standard setting is 50psi. The standard bypass feature permits the flow of water back through the valve