Caleffi 553549A

Caleffi AutoFill™ Automatic Filling Valve, Pre-Adjustable, Series 553, 1/2 in Nominal Size, C x FNPT, 230 psi, 150 deg F, Media: Water/Glycol, Brass Body, NBR Seal, 4-3/4 in L

• Anti-scale with visual system pressure indicator
• Automatic fast-filling - Fast fills the system to set pressure then automatically shuts off the water feed, no levers to flip or valves to close
• Maintains stable pressure at pre-setting - Fill the system to a set pressure and maintain that pressure setting regardless of inlet pressure variations
• Anti-scale polymer materials - Prevents scaling on internal sliding surfaces, assuring stable pressure control and long operating life
• Built-in shut-off valve and check valve - Allows isolation of system from supply and check valve prevents loss of system pressure if the supply water drops below system pressure
• Pre-calibration - Before charging the system, use a screwdriver to turn dial to intended system pressure, downstream pressure gauge is not required