Series 500 Sight Window

Series 500 Sight Window

Series SFI-300F MIDWEST Sight Flow Indicator

Series SFI-300F MIDWEST Sight Flow Indicator

Series 550 Sight Window

Shows Level or Contents of Tanks, Pipelines; Fused Glass and Steel Construction

The Series 550 Sight Window is a range of glass with plated steel body sight windows which display level or contents of tanks or pipelines. Connections are standard NPT in sizes ranging from 1/4 to 2".

Product Applications

  • Hydraulic Tanks
  • Pressure Vessels
  • Coolant Tanks
  • Hydraulic Lines
  • Oil Reservoirs
Starting at $18.00
Grouped product items
Model Description Availability* Qty Price
SFI-550-1 Sight window, 1" male NPT. 1-3 days*
SFI-550-1/2 Sight window, 1/2" male NPT. 1-3 days*
SFI-550-1/4 Sight window, 1/4" male NPT. Less Than 1 Week*
SFI-550-1-1/2 Sight window, 1-1/2" male NPT. 1-3 days*
SFI-550-1-1/4 Sight window, 1-1/4" male NPT. Less Than 1 Week*
SFI-550-2 Sight window, 2" male NPT. 1-3 days*
SFI-550-3/4 Sight window, 3/4" male NPT. 1-3 days*
SFI-550-3/8 Sight window, 3/8" male NPT. 1-3 days*


Compatible gases and liquids.
Wetted Materials:
Window: glass; Body: plated steel.
Temperature Limit:
200°F (93°C).
Pressure Limit:
125 psig (8.6 bar).
1/4" to 2" male NPT.


  • Glass to metal bond for utmost reliability
  • Plated steel bodies have convenient hex wrench surfaces for easy installation
  • Windows are clear, ripple free, and flush with the front face, with no recess on which dirt might collect

Product Literature

Catalog Pages

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Model Description Availability* Price