Nugent 57-105-201 Sight Flow Indicator

The Nugent 57-105-201 Sight Flow Indicator from Nugent Filters is an inline 1 in FNPT device that provides immediate visual confirmation of liquid movement in hydraulic, lubrication, coolant, and other process lines. Its industrial metal body houses dual viewing windows for quick observation of flow, air entrainment, and fluid condition, supporting maintenance and troubleshooting activities. Designed for inline piping mounting and suitable for liquids and process fluids, it delivers a clear visual indication of flow movement. Commonly installed in hydraulic power units, lubrication circuits, coolant circulation, filtration systems, and chemical processing equipment, it serves applications across manufacturing, chemical processing, fluid handling, and power generation. The connector is 1 in NPT Female (FNPT), and replacements include Nugent 57-105-202 Sight Flow Indicator, Kenco Sight Flow Indicator, and OPW Visi-Flo 1 in FNPT Sight Flow Indicator.