Dwyer Instruments SFI-300-3/4 Sight Flow Indicator Double Window 3/4" NPT

The Dwyer Instruments SFI-300-3/4 Sight Flow Indicator is an efficient part that is used in measuring the flow of liquids and gases in HVAC systems. Its double window design that enables flow observation from both the front and the back. This indicator is made from brass and can be fitted with a 3/4 inch NPT connection, which makes it ideal for coolant tanks, hydraulic lines and oil reservoirs. The tempered glass windows make the structure more durable and resistant to pressure of up to 125 psi. Advantages are the possibility of easy cleaning of windows, and the possibility of checking the flow direction, which is essential for the functionality of HVAC systems.