Caleffi 553542A Filling Valve

The Caleffi 553542A Filling Valve is an automatic, pre-adjustable filling valve designed for precise, reliable boiler and hydronic system fill pressure. With a 1/2 inch nominal size and end connections of Female Threaded Union x Male Threaded Union, this brass-bodied valve delivers durable performance and easy field adjustments.

Its compact 4-3/4 inch end-to-end distance, 150°F temperature rating, and 230 PSI pressure rating make it suitable for a wide range of residential and commercial installations. The unit features a PA 66 GF 30 cover and NBR seal for long-lasting reliability, plus a Visual System Pressure Indicator to monitor pressure at a glance. It complies with CSA standards for Canada and the US, with a pressure setting range of 3 to 60 PSI and a factory setting of 15 PSI. The gauge scales 0 to 60 PSI, ensuring accurate control.

• Automatic, pre-adjustable filling valve for boilers and hydronic systems
• Brass body with NBR seal and PA 66 GF 30 cover for durability
• 1/2 inch nominal size; Female Threaded Union x Male Threaded Union end connections; 4-3/4 inch overall length
• Pressure setting range 3 to 60 PSI; factory setting 15 PSI; 0 to 60 PSI gauge
• CSA (Canada and US) compliant; Visual System Pressure Indicator