Amtrol 110 Fill-Trol Expansion Tank Only 4.4 Gallon 1/2" NPTF

The Amtrol 110-002 Fill-Trol expansion tank is a replacement tank designed for closed loop hydronic heating and radiant heating systems. This model includes the tank only without the Fill-Trol automatic fill valve, making it ideal for replacement applications where the existing valve is still functional.

This pre-pressurized diaphragm-type expansion tank features Amtrol's renowned Extrol design with a 4.4 gallon total capacity and 2.5 gallon maximum accepted volume. The tank is factory pre-charged to 12 psig, allowing the tank pressure to control system fill and maintain proper operating pressure.

Key Features:

• 4.4 gallon tank capacity with heavy-duty butyl diaphragm
• 1/2" NPTF threaded connection for easy installation
• Maximum operating pressure of 100 psig
• Maximum operating temperature of 240°F
• Factory pre-charged to 12 psig
• Fully adjustable up to maximum working pressure
• Deep drawn steel construction for superior durability
• Compact dimensions: 11" diameter x 17.375" height
• Made in USA with 5-year limited warranty

This expansion tank accepts expanded water as system temperature rises, reducing pressure build-up and protecting your heating system components. The 110-002 provides accurate system make-up and is designed exclusively for heating applications—not suitable for potable water use.