Aluminum
Fluid Level Sight Glasses
With Natural Glass
GN 743

GN 743


GN 743

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Specification
Information

Sight glass body:
Aluminum, fine turned, matte shot-blast finish, or
Aluminum, fine turned, black anodized finish
Sight glass: Natural glass
Seal: NBR rubber (Perbunan)
Reflector: Heat resistant technopolymer plastic (Polysulfon)

Fluid level sight glasses GN 743 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.
NBR seal: maximum heat resistance: 100°C (212°F).
Sight glasses can be ordered with or without a reflector.
Note: When mounting fluid level sight glases on walls of less than 4 mm thickness, use nut GN 543.1.

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

Dimensions in:

millimeters
(inches)

Part Number
d1
d2
Thread
d3
l1
l2
s
Max Pressure,
psi @ 70°F
Plain Finish Anodized Finish
With
Reflector
Without
Reflector
With
Reflector
Without
Reflector
7
(.28)
M14 x 1.5
20
(.79)
7.5
(.30)
6.5
(.26)
18
(.71)
 
11
(.43)
M16 x 1.5
22
(.87)
8
(.31)
7.5
(.30)
20
(.79)
725
14
(.55)
M20 x 1.5
26
(1.02)
8.5
(.33)
7.5
(.30)
23
(.91)
725
18
(.71)
M26 x 1.5
32
(1.26)
9
(.35)
8
(.31)
30
(1.18)
360
18
(.71)
M27 x 1.5
32
(1.26)
9
(.35)
8
(.31)
30
(1.18)
360
24
(.94)
M33 x 1.5
40
(1.57)
11
(.43)
8.5
(.33)
36
(1.42)
290
32
(1.26)
M40 x 1.5
50
(1.97)
12
(.47)
9
(.35)
46
(1.81)
180
32
(1.26)
M42 x 1.5
50
(1.97)
12
(.47)
9
(.35)
46
(1.81)
180
BSPP Parallel Thread Table

Dimensions in:

millimeters
(inches)

Part Number
d1
d2
Pipe Thread
d3
l1
l2
s
Max Pressure,
psi @ 70°F
Plain Finish Anodized Finish
With
Reflector
Without
Reflector
With
Reflector
Without
Reflector
7
(.28)
G 1/4"
20
(.79)
7.5
(.30)
6.5
(.26)
18
(.71)
 
11
(.43)
G 3/8"
22
(.87)
8
(.31)
7.5
(.30)
20
(.79)
725
14
(.55)
G 1/2"
26
(1.02)
8.5
(.33)
7.5
(.30)
23
(.91)
725
18
(.71)
G 3/4"
32
(1.26)
9
(.35)
8
(.31)
30
(1.18)
360
24
(.94)
G 1"
40
(1.57)
11
(.43)
8.5
(.33)
36
(1.42)
290
32
(1.26)
G 1 1/4"
50
(1.97)
12
(.47)
9
(.35)
46
(1.81)
180
32
(1.26)
G 1 1/2"
60
(2.36)
13
(.51)
9
(.35)
55
(2.17)