Sight Tubes | McMaster-Carr

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670 Products

Liquid-Level Gauges

Liquid-Level Indicators

Oil-Level Indicators

Monitor fluid levels in gear boxes, crank cases, and other reservoirs

118 products

High-Pressure Oil-Level Indicators

Monitor fluid levels in pressurized applications, such as hydraulic systems

83 products

Build-Your-Own Liquid-Level Indicators with Shut-Off Valve

Build your own level indicator with valves, gauges, and guard rods

120 products

Flexible Easy-View Liquid-Level Indicators

Bend around the contours of your hydraulic fluid, oil, or water tank

14 products

Liquid-Level Indicators with Shut-Off Valve

Stop the flow so you can clean and replace gauge glass without removing the indicator

16 products

Shatter-Resistant Oil-Level and Temperature Indicators

Monitor fluid level and temperature through a durable nylon window

8 products

Easy-View High-Pressure Oil-Level Indicators

The nylon body and window resist shattering and allow you to check levels from any angle

7 products

Chemical-Level Indicators

Check the level of liquids containing chemicals such as boric acid and sodium bicarbonate

14 products

Easy-View Oil-Level Indicators

Made with clear plastic so you can check fluid levels from any angle

15 products

High-Pressure Oil-Level and Temperature Indicators

Check the temperature and the fluid level in a pressurized system

33 products

Heavy Duty Liquid-Level Indicators

Withstand vibration, high pressures, and high temperatures

19 products

Oil-Level and Temperature Indicators

Monitor the fluid level and temperature in gear boxes, crank cases, and other reservoirs

14 products

Other Products

Gauge Glass

Create or repair liquid-level gauges to monitor fluid levels in containers

138 products

Flow Sights

Visually confirm flow and inspect liquid color and clarity

154 products

Gauge Glass Gaskets

Seal the glass on level indicators to monitor liquids without leaks

14 products

Density Meter Jars

Add liquid and immerse a density meter until it floats for precise readings

6 products

Hose and Hose Fittings

Flexible and stronger than tubing; often used to convey liquids and gases under pressure

2 products