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3350-H3 | 1/2" Union Press Cartridge Pressure Reducing Valve w/ AutoFill | Taco Size (in)_18 x 12 1-1/2 PVC TRUE UNION INDUSTRIAL1 2" Union Press Cartridge Pressure Reducing Valve w AutoFill The 3350 H3 valve is used to automatically feed water to a hydronic system whenever pressure in the system drops below the pressure setting of the valve. Product Features 1 2" Union Press Automatic Pressure Reset from Fast Fill Easy External Dial up Pressure Setting Set Pressure Indicator Simple serviceability with the unique one piece cartridge Internal check allows the cartridge to be