GN 743.3 Oil level sight glasses Brass / natural glass, resistant up to 180 °C


GN 743.3 Oil level sight glasses, Brass / ESG glass Type: B - without reflector
Type: B - without reflector
GN 743.3 Oil level sight glasses, Brass / ESG glass Type: B - without reflector GN 743.3 Oil level sight glasses, Brass / ESG glass Type: A - with reflector

Product description


Oil level sight glasses GN 743.3 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.

Oil level sight glasses GN 743.3 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 mounting nut GN 543.1.



Technopolymer (Polysulfon)

Sight glass
temperature resistant up to 180 °C

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



Mounting nuts GN 543.1

On request

EPDM seal

Technical drawing

Hide technical drawing
GN 743.3 Oil level sight glasses, Brass / ESG glass sketch

Article options / Table


Awith reflector
Bwithout reflector
Show / Hide columns
11G 3/8M 16 x 1,5-2287,520
14G 1/2M 20 x 1,5-268,57,523
18G 3/4M 26 x 1,5M 27 x 1,5329830
24G 1M 33 x 1,5-40118,536

Build & Price

Window glass d1
Inch thread d2
Fine thread d1

Selected Part (How to order)

Total (net)
plus VAT 1,00 €
gross 6,24 €
In stock
incl. material surcharge: 0,17 €
The material surcharge is already included in the price.
Weight: 0,019 kg
If this article is new in our product range, it may happen that details concerning weight are as yet not listed.
If you do need weight details, please contact our Sales Department!
Phone+49 7723 6507 - 0
RoHS: Yes
This article is RoHS-compliant in application of Annex III., which means it complies with EU Directive 2011/65/EU, including extension (2015/863/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)).
Please note our quantity discounts.
With a total value (net) per order:
from 175,00 Euro -> 10 % discount
from 275,00 Euro -> 20 % discount
from 375,00 Euro -> 30 % discount
With a total value (net) per order:
All prices in accordance with our price list No. 52, valid from 1 May 2019, plus VAT only valid for Germany.

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