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Amtrol 112 FILL-TROL Expansion Tank 14.0 Gallon (112-2) The Amtrol FILL-TROL 112 Expansion Tank system consists of a specially adapted EXTROL pre-pressurized diaphragm-type expansion tankand the FILL-TROL a specially designed automatic pressure-reducing fill valve. Provides accurate system make up Fully Adjustable up to a maximum working pressure of 100 psig Factory pre-charged to 12 psig Amtrol FILL-TROL 112 Expansion Tank Specifications: Model Number - 112 Tank Volume (Gallons) - 14.0 Max. Accept. Volume (Gallons) - 11.3 A Height (Inches) - 23 B Diameter (Inches) - 15-3/8 System Conn. (NPTF) - 1/2 Maximum Working Pressure = 100 PSIG Maximum Operating Temperature = 240 F Factory Precharge = 12 PSIG How the Amtrol FILL-TROL 112 Expansion Tank System Works: Water enters the FILL-TROL valve pushing open the check valve and flows into the heating system. The automatic shut-off valve is kept open by the diaphragm pressing against the pressure plate raising the stem of the fill gate which compresses the automatic shut-off valve spring. When the heating system reaches fill pressure (12 psig) the tank's diaphragm depresses and the automatic shut-off valve is closed. Whenever system pressure falls below 12 psig the automatic shut-off valve is pressed open by the diaphragm. Make-up water flows into the system to restore pressure.