GN 743.1 Fluid Level Sight Glasses Aluminum / ESG glass, resistant up to 356 °F (180 °C), black anodized


Product description


GN 743.1 Fluid Level Sight Glasses offer genuine glass of high stability and scratch proof. The sealing is achieved 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.

The outside diameter of these oil level sight glasses with recessed hexagon is chosen to match mounting holes for tube connections according to DIN 3852.

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.

GN 743.1 oil level sight glasses can be used on pressurised oil tanks. Tests regarding maximum pressure are available on request.

Assembly instruction:

For mounting on walls of less than 4 mm thickness please use a fixing nut GN 543.1.


Sight glass body
  • Aluminum
  • fine turned, black anodized

Contrast screen
Technopolymer (Polysulfon)

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

Rubber FPM (Viton®)
Identification by not black finish of the seal

RoHS compliant


Fixing nuts GN 543.1

On request

EPDM seal

Technical drawing

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GN 743.1 Aluminum / ESG glass Oil level sight glasses, resistant up to 356 °F (180 °C), black anodized sketch

Part Options / Table


ASwith contrast screen, black anodized
BSwithout contrast screen, black anodized
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Dimensions in: Inch | Metric
Pipe thread
Fine 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
Pipe thread d2
Fine thread d2

Selected Part

Total USD (net)
In stock: 0
Call / Email for Delivery Time
Please note our quantity discounts (USD).
≥ 250$11.50
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: 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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