Stainless Steel
Fluid Level Sight Glasses
With ESG Glass
GN 743.5


RoHS Compliant

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Specification
Information

Sight glass body: Stainless steel, European Standard No. 1.4305 (American Standard 303 series)
Sight glass: ESG glass
Retaining ring: Stainless steel, European Standard No. 1.4310 (American Standard 301 series)
Seal: FPM rubber (Viton®)

Fluid level sight glasses GN 743.5 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 oil level site glasses are suitable for applications with subpressure.
Maximum heat resistance: 180°C (356°F).
Note: When mounting fluid level sight glasses on walls of less than 4mm thickness, use nut GN 543.1.

See our Technical Section for pipe thread size details.
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Metric Thread Table

Dimensions in:

millimeters
(inches)

Part Number
d1
d2
Thread
d3
l1
l2
s
11
(.43)
M16 x 1.5
22
(.87)
8
(.31)
7.5
(.30)
20
(.79)
14
(.55)
M20 x 1.5
26
(1.02)
8.5
(.33)
7.5
(.30)
23
(.91)
18
(.71)
M26 x 1.5
32
(1.26)
9
(.35)
8
(.31)
30
(1.18)
24
(.94)
M33 x 1.5
40
(1.57)
11
(.43)
8.5
(.33)
36
(1.42)
32
(1.26)
M42 x 1.5
50
(1.97)
12
(.47)
9
(.35)
46
(1.81)
BSPP Parallel Thread Table

Dimensions in:

millimeters
(inches)

Part Number
d1
d2
Pipe Thread
d3
l1
l2
s
Without
Reflector
11
(.43)
G 3/8"
22
(.87)
8
(.31)
7.5
(.30)
20
(.79)
14
(.55)
G 1/2"
26
(1.02)
8.5
(.33)
7.5
(.30)
23
(.91)
18
(.71)
G 3/4"
32
(1.26)
9
(.35)
8
(.31)
30
(1.18)
24
(.94)
G 1"
40
(1.57)
11
(.43)
8.5
(.33)
36
(1.42)