331 Rectangular Sight Glass Level indicator With welding ends

Rectangular Sight Glass
Level indicator
With welding ends
Operating pressure: Up to 35 bar

For Liquid Level display, visual checkup and observation on vessels, boilers and silos at pressures up to 35 bar and high temperatures.
The connections sockets with ⌀20 mm are mounted to the body ends. Other diameters available on request.

Show all product specifications

Flange: 1.4571, S235GH
Glass: Borosilicate glass DIN 7081, (Reflex or Transparent)
Seal: C4400, Graphite, PTFE, NBR, Viton

Other materials on request

Installation guideline:
After welding of the base flange, the sealing surface must be checked for deformations! Reworking may be required!

ACI Type 331
220 mm
Flange 1.4571
Borosilicate glass transparent           11-331-16-220-2-1-1-000
Standard construction

For aggressive media or steam we recommend adding a mica disk to protect the glass.


Nominal diameter
Pressure rating PN16, PN35
Sight glass body 1.4571, S235GH
Process Connection welding ends
Shape Rectangular Sight Glasses
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