BELL & GOSSETT 1-1/2" SWEAT THERMOFLOW INDICATOR (MODEL TFI-1-1/2) 15-69 GPM FLOW RATE FOR BALANCING WATER FLOWS WITH A B&G THERMOFLO INDICATOR INSTALLED IN EACH CIRCUIT OF A HYDRONIC SYSTEM, FLOWS CAN BE ACCURATELY BALANCED ACCORDING TO DESIGN REQUIREMENTS.Click Here for Additional Information"