Amtrol 30 EXTROL Expansion Tank 4.4 Gallon (102-1) The Amtrol 30 EXTROL Expansion Tank is designed to be installed in residential and commercial applications and it factory pre-charged to 12 PSIG. Though this expansion tank can be mounted horizontally this can cause a decrease in the products life. Amtrol EXTROL 30 Expansion Tank Features: For use with closed hydronic heating and cooling systems Factory pre-charged to 12 psig Pre-charge should be adjusted to equal minimum operating pressure at tank location Maximum working pressure: 100 psig Maximum operating temperature: 240 F Amtrol EXTROL 30 Expansion Tank Specifications: Model Number - 30 Tank Volume (Gallons) - 4.4 Max. Accept. Volume (Gallons) - 2.5 A Height (Inches) - 15 1/2 B Diameter (Inches) - 11 System Conn. (NPTM) - 1/2 Maximum Working Pressure = 100 PSIG Maximum Operating Temperature = 240 F Factory Precharge = 12 PSIG