GN 743.5 Fluid Level Sight Glasses Stainless Steel, with ESG Glass, resistant up to 356° F (180° C)


Product Family Stainless Steel

Standard parts made of rustproof stainless steel have been designed for use in the food sector, in the chemical industry, for aggressive ambient conditions or for outdoor use.

  • corrosion-resistant
  • precise fit
  • environmentally friendly
Show all Stainless Steel products

Product description


GN 743.5 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. Outside diameter is chosen to match mounting holes for tube fittings according to DIN 3865.
Seal is housed in a groove and therefore cannot be lost. Meanwhile, this groove prevents the seal from being extruded when the sight glass is tightened. The location of this seal also allows the use of a softer Elastomer, which guarantees better and easier sealing.

Fluid level sight glasses GN 743.5 can be used on pressurized oil tanks. Tests regarding maximum pressure are available upon request. Also, these fluid level site glasses are suitable for applications with subpressure.

Note: When mounting fluid level sight glasses on walls of less than 4mm thickness, use nut GN 543.1.


Sight glass body
Stainless steel, AISI 303, European Standard No. 1.4305

Sight glass
  • ESG glass
  • Temperature resistant up to 356° F (180° C)

FPM rubber (Viton®)

Contrast screen (Type A)
Technopolymer (Polysulfan)

Retaining ring (Type B)
Stainless steel, AISI 301, European Standard No. 1.4310

Identification by not black finish of the seal

RoHS compliant


Nut GN 543.1

Technical drawing

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GN 743.5 Stainless Steel Fluid Level Sight Glasses, with ESG Glass, resistant up to 356° F (180° C) sketch

Part Options / Table


AWith contrast screen
BWithout contrast screen
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Dimensions in: Inch | Metric
Pipe Thread
.43G 3/8M 16 x
.55G 1/2M 20 x
.71G 3/4M 26 x
.94G 1M 33 x
1.26G 11/4M 42 x

Build & Price

Window glass d1
Pipe thread d2
Fine thread d2

Selected Part

Total USD (net)
In stock: 0
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Please note our quantity discounts (USD).
≥ 500$11.80
Weight: 0.041 lbs
If weight is not listed, please contact our Sales Department for additional information regarding weight.
Phone: 800-877-8351
RoHS compliant: Yes
This article conforms to RoHS, which means it complies with EU Directive 2011/65/EU for restricting the use of certain hazardous substances in electrical and electronic devices. The Directive regulates the use of hazardous substances in devices and components. The implementation in national law is summarily described with RoHS(Restriction of (the use of certain) hazardous substances)).
All Prices are in US Dollars. Taxes Not Included.

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