The AMTROL FILL-TROL+ system consists of a specially adapted EXTROL+ pre-pressurized, diaphragm-type expansion tank, and the FILL-TROL, a specially designed, automatic, fill valve.
Provides accurate system make up
Eliminates need for a separate, automatic fill valve
Fully adjustable up to a maximum working pressure of 100 psig
Factory pre-charged to 12 psig; tank pressure controls system fill