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System of Measurement
Inch
Metric
Pipe Size
1/4
3/8
1/2
3/4
1
1
1/4
1
1/2
2
Thread Type
BSPP
Metric
NPT
NPTF
UN/UNF (SAE Straight)
Material
Aluminum
Brass
Glass
Plastic
Quartz
Rubber
Stainless Steel
Steel
Zinc Alloy
Window Diameter
1/4"
5/16"
3/8"
7/16"
1/2"
9/16"
5/8"
11/16"
3/4"
13/16"
7/8"
15/16"
1"
1
1/16"
1
1/8"
1
3/16"
1
1/4"
1
5/16"
1
3/8"
1
7/16"
1
1/2"
1
9/16"
1
5/8"
1
3/4"
1
7/8"
1
15/16"
2"
2
3/16"
2
1/2"
2
9/16"
2
3/4"
3
1/8"
3
1/4"
3
1/2"
3
35/64"
4"
5"
For Use With
Alcohol-Based Solvents
Beverage
Chemicals
Compressed Air
Food
Acetic Acid (White Vinegar)
Air
Diesel Fuel
Fuel Oil
Gasoline
Hydraulic Fluid
Hydraulic Fluid (Petroleum Based)
Inert Gas
Ketone
Oil
Steam
Water
Maximum Pressure @ Temperature
10 psi @ 70° F
20 psi @ 70° F
25 psi @ 70° F
30 psi @ 70° F
50 psi @ 70° F
60 psi @ 70° F
65 psi @ 70° F
75 psi @ 70° F
90 psi @ 70° F
100 psi @ 70° F
125 psi @ 70° F
150 psi @ 70° F
175 psi @ 70° F
180 psi @ 70° F
200 psi @ 70° F
225 psi @ 70° F
230 psi @ 70° F
250 psi @ 70° F
Thread Size
3/4"
-16
1
1/16"
-12
1
5/16"
-12
1
7/8"
-12
M16
M20
M25
M27
M30
M40
Hex Size
5/8"
3/4"
13/16"
7/8"
15/16"
1"
1
1/16"
1
1/8"
1
3/16"
1
1/4"
1
3/8"
1
7/16"
1
1/2"
1
5/8"
1
3/4"
1
7/8"
2"
2
1/8"
2
3/16"
2
1/4"
2
1/2"
2
5/8"
2
3/4"
For Liquid Appearance
Clear
Dark
Maximum Temperature
Less than 200° F
200° F to 249° F
250° F to 499° F
500° F or greater
Fitting Connection
Flanged
Quick Clamp
Threaded
Window Material
Glass
Plastic
Quartz
Mount Type
Clamp On
Flange
Screw In
Weld On
Connects To
Pipe
Tube
Hole Diameter
5/8"
3/4"
1"
1
1/4"
1
1/2"
1
3/4"
1
7/8"
2"
2
1/4"
2
3/8"
2
1/2"
3
1/8"
4"
4
11/16"
5"
Minimum Temperature
-40° F
-20° F
0° F
30° F
Not Rated
Seal Material
Buna-N
Fluoroelastomer
Neoprene
Silicone Rubber
REACH
Compliant
Not Compliant
RoHS
Compliant
Compliant with Exemptions
Not Compliant
Export Control Classification Number (ECCN)
EAR99
DFARS Specialty Metals
Exempt
OD
1"
1
1/4"
1
1/2"
2"
2
1/2"
3"
3
5/8"
4"
4
7/16"
5"
5
13/16"
7"
Tube OD
1"
1
1/2"
2"
2
1/2"
3"
4"
Performance
High Pressure
High Temperature
High Vacuum
High Visibility
Multi-Angle View
Shatter Resistant
Flange OD
1.18"
1
21/64"
1.57"
1
5/8"
1
7/8"
1.98"
1.984"
2.16"
2
1/4"
2.515"
2.52"
2
9/16"
2
3/4"
2.95"
3.047"
3
1/8"
3.579"
3.58"
4
1/2"
4.68"
4.682"
6"
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246 Products
Sights
Sights
Observe and monitor the contents of pipes, tanks, and other containers
85 products
High-Pressure Sights
Thick glass fused to a metal body resists cracking at high pressures
21 products
High-Visibility Sights
An indicator ball lets you view liquid movement and level changes from afar
25 products
Shatter-Resistant Sights
Window and body are made from a single piece of plastic for shatter resistance
17 products
Easy-View Sights
View tank contents from multiple angles through the plastic domed window
6 products
Sights for Quick-Clamp Sanitary Tube Fittings
Connect to quick-clamp fittings in food processing lines
12 products
Through-Wall Sights
Mount in unthreaded holes from the inside of your tank using a lock nut
24 products
High-Temperature Sights
Quartz window withstands heat up to 1600° F in equipment such as kilns
6 products
Press-Fit Through-Wall Sights
Press into a hole from the outside of your tank, no mounting nuts required
3 products
Weld-On Sights
Weld to single-wall tanks in equipment such as process vessels and mixers
6 products
Easy-View All-Plastic Sights
View tank contents from multiple angles through the plastic domed window
6 products
Sights for Oil Inspection
Reservoir is made of clear plastic so you can monitor oil quality
6 products
Flanged Sights
The extended flange is easily bolted to tank walls
5 products
Easy-View Flanged Sights
Check tank contents from multiple angles through the domed window
The extended flange is easily bolted to tank walls
1 product
High-Vacuum Sights for Quick-Clamp Fittings
Connect to ISO-KF quick-clamp connections on high-vacuum chambers
12 products
Ultra-High-Vacuum Flanged Sights
A CF flange bolts onto vacuum chambers, tee fittings, and manifolds
11 products
The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)