• Wafer Flange (Fits Between Two 150 Lb ASME Flanges)
  • Full Protective Shield Around Inner Glass Tube
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S21 Series Full View Flanged Plastic Sight Flow Indicators

Sight Flow Indicator
S21 Series Full View Flanged Plastic Sight Flow Indicators

Sight Flow Indicator
S21 Series Full View Flanged Plastic Sight Flow Indicators

Sight Flow Indicator
S21 Series Full View Flanged Plastic Sight Flow Indicators

Sight Flow Indicator
S21 Series Full View Flanged Plastic Sight Flow Indicators

Sight Flow Indicator
Series N/A S21F
Indicating Device N/A None
Size N/A 1-1/2 in N/A 2 in N/A 3 in N/A 4 in N/A 6 in
End Connections N/A Wafer Flange
Hardware N/A 18-8 Stainless Steel (SS)
Pressure Rating @ 75 ºF N/A 150 PSIG N/A 150 PSIG N/A 110 PSIG N/A 110 PSIG N/A 70 PSIG
Pressure Rating @ 180 ºF N/A 110 PSIG N/A 110 PSIG N/A 90 PSIG N/A 90 PSIG N/A 55 PSIG
Pressure Rating @ 225 ºF N/A
Pressure Rating @ 290 ºF N/A
Body Material N/A Polypropylene
End Fitting Material N/A Polypropylene
Gasket Material N/A Fluorocarbon (FKM)
Flange Material N/A Polypropylene
Cylinder Material N/A Borosilicate
Shield N/A Acrylic
Visible Diameter/Length N/A 2.50 in N/A 3.00 in N/A 3.25 in N/A 3.63 in N/A 4.25 in
Pressure Rating @ 140 ºF N/A
Length N/A 4.500 in N/A 5.00 in N/A 5.25 in N/A 5.63 in N/A 6.13 in
Width N/A 3.38 in N/A 4.13 in N/A 5.44 in N/A 6.88 in N/A 8.69 in
Height N/A 3.38 in N/A 4.13 in N/A 5.44 in N/A 6.88 in N/A 8.69 in
Weight N/A 2.00 lbs N/A 3.00 lbs N/A 3.00 lbs N/A 5 lbs N/A 7 lbs
Packaging Material N/A Cardboard Box
Type N/A Plain
Options N/A
  • Buna-N or Ethylene Propylene (EPDM) Gaskets
  • Flutter Device (PTFE/Fluorocarbon (FKM))
Application Notes N/A
  • Steam Service: Not acceptable
  • Potable Water: The glass has not been tested and certified to be acceptable for potable water
  • Vacuum Service: Suitable for vacuum service
  • Gaseous Service: Not acceptable for lightweight gases
  • Corrosion: Before ordering, verify all materials of our sight flow indicators are compatible with the service media(s), intermittently used cleaners, the environment, and cleaning processes in conjunction with the temperatures and pressures of the application(s) and future applications. John C. Ernst Co. does not make chemical compatibility recommendations. Compatibility is the responsibility of the user.
Replacement Parts N/A Please contact our sales department