1/2" Economy Brass fill valves help replace water from lost from evaporation or splash in ponds, waterfalls and other water feature applications. Ideal for use in skimmers, vaults and the water fill box for maintaining water levels in many different applications. The Heavy duty brass body and brass rods are far superior to normal plastic fill valves. All valve rods (arms) can be adjusted to fit your exact requirements. The water fill valves come with a plastic float. Recommended water pressures is 35 psi.