The Caleffi 553542A Automatic Fill Valve is designed to automatically maintain proper water pressure in closed-loop hydronic heating systems. Installed on the supply line, this valve regulates incoming water to ensure the system remains filled and operating at the correct pressure.

Constructed from durable brass, the valve is designed for long-lasting performance in residential and commercial heating systems. The automatic operation helps maintain system pressure without the need for constant manual adjustment.

• Automatic fill valve designed for hydronic heating systems
• Maintains proper water pressure in closed-loop systems
• 1/2 inch NPT connection for plumbing installation
• Durable brass body for long-lasting reliability
• Helps simplify system maintenance and operation

Weight	1.75 lb
Color	Gold & Brass Tones
Finish Type	Unfinished
Height	5.94 in.
Length	2.00 in.
Material	Brass
Type	Pressure Valves, Radiator Valves
Width	4.81 in.
Inventory Number	CALE553542A
MPN	553542A