GN 743.1 Fluid Level Sight Glasses Aluminum, with ESG Glass, resistant up to 356° F (180° C)


GN 743.1 Aluminum Fluid Level Sight Glasses, with ESG Glass, resistant up to 356° F (180° C) Type: A - with contrast screen, blank

Product description


GN 743.1 Fluid level sight glasses offer the following features:
1. Genuine glass of high stability and scratch proof.
2. Sealing with an O-ring on the periphery and not on the face edge of the glass. Leak tightness is therefore not affected by axial pressures.
3. The seal is housed in a groove and it can therefore not be lost. In addition, this groove prevents the seal from being extruded when the sight glass is tightened. The location of this seal allows also the softer elastomer which guarantees better and easier sealing.

Fluid level sight glasses GN 743.1 can be used on pressurized oil tanks. Tests regarding maximum pressure are available upon request.
Viton seal: maximum heat resistance: 180°C (356°F).
Sight glasses may be ordered without reflectors.
Note: When mounting oil level sight glasses on walls of less than 4mm thickness, use nut GN 543.1.

See our Technical Section for pipe thread size details.


Sight glass body
  • Aluminum
  • turned, with with matte shot-blast finish

Sight glass
  • ESG glass

  • Heat resistant technopolymer plastic (Polysulfon)

  • FPM rubber (Viton®)


Fixing nuts GN 543.1

Technical drawing

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GN 743.1 Aluminum Fluid Level Sight Glasses, with ESG Glass, resistant up to 356° F (180° C) sketch

Part Options / Table


Awith contrast screen, blank
Bwithout contrast screen, blank
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Dimensions in: Inch | Metric
Pipe Thread
.28G 1/4M 14 x 1.5-.
.43G 3/8M 16 x 1.5-.
.55G 1/2M 20 x 1.5-
.71G 3/4M 26 x 1.5M 27 x
.94G 1M 33 x 1.5-
1.26G 11/4M 40 x 1.5M 42 x
1.26G 11/2--

Build & Price

Window glass d1
Inch thread d2
Fine thread d2

Selected Part

Total USD (net)
In stock: 8
In stock
Please note our quantity discounts (USD).
≥ 250$11.11
Weight: 0.013 lbs
If weight is not listed, please contact our Sales Department for additional information regarding weight.
Phone: 800-877-8351
RoHS compliant: -
This article does not conform to RoHS.
For RoHS conforming alternative products, please contact our Sales Department!
Phone +49 7723 6507- 0
All Prices are in US Dollars. Taxes Not Included.

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