Sight Tubes | McMaster-Carr

	Pipe Size Pipe Size

	Thread Type Thread Type

NPT

NPTF

UNF

	For Use With For Use With

Acetic Acid

Air

Alcohol-Based Solvents

	Connection Center-to-Center Connection Center-to-Center

	Material Material

	Maximum Temperature Maximum Temperature

	Shape Shape


Straight	Tubular

90° Elbow	Oval

	Maximum Pressure Maximum Pressure

	Overall Height Overall Height

	Connection Style Connection Style

Threaded

Quick Clamp

Barbed

	OD OD

	Minimum Temperature Minimum Temperature

	Connection Type Connection Type


Pipe	Tube

	Window Material Window Material

Glass

Plastic

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Gender Gender

Male

Female

	Window Height Window Height

	Length Length

	Body Material Body Material

	Seal Material Seal Material

Rubber

Plastic

Fiber/SBR Rubber

	Mount Type Mount Type

Screw

Through Wall

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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641 Products

Liquid-Level Indicators

Oil-Level Indicators

Monitor hydraulic fluid or oil level in gear boxes, crank cases, and other reservoirs.

High-Pressure Oil-Level Indicators

Monitor hydraulic fluid or oil level in pressurized applications.

Shatter-Resistant Oil-Level Indicators

The nylon body and window make these indicators shatter resistant.

Water-Level Indicators

These flexible indicators bend to follow the contours of a tank.

Tubular Gauge Glass

Replace existing gauge glass or combine with valves and guard rods to build your own level indicator.

Gauge Glass for Heavy-Duty Level Indicators

Use this gauge glass with heavy duty level indicators.

Level Indicators with Shut-Off Valve

Shut-off valves stop flow so you can clean and replace gauge glass without removing these indicators from your equipment.

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

Combine a pair of valves with a gauge glass and four guard rods to build a complete level indicator.

High-Pressure Oil-Level and Temperature Indicators

These indicators mount from the outside of your tank.

Through-Wall High-Pressure
Oil-Level and Temperature Indicators

Mount these indicators from the inside of your tank through unthreaded holes.

Shatter-Resistant Oil-Level and Temperature Indicators

The nylon body and window make these indicators shatter resistant.

Oil-Level and Temperature Indicators

Simultaneously monitor hydraulic fluid or oil level and temperature in gear boxes, crank cases, and other reservoirs.

Gaskets for Tubular Gauge Glass

Seal the glass on your level indicator.

Gaskets for Heavy-Duty Level Indicators

Use these gaskets with heavy duty level indicators to seal the glass.

Heavy-Duty Level Indicators

Monitor liquid level in applications that have vibration, high pressures, and high temperatures. These indicators are also known as armored level gauges.

Flow Sights

Compact Flow Sights for Water and Oil

The low-profile body fits in areas with limited clearance.

Compact Flow Sights with Indicator for Water and Oil

For visual confirmation of flow from a distance, these sights have a ball indicator that moves when flow is present.

Full-View Flow Sights for Water and Oil

A large tubular window provides an unobstructed view of liquid color, clarity, and movement from multiple angles.

Full-View Flow Sights with Indicator for Water and Oil

A ball indicator increases the visibility of flow for checking at a distance.

Flow Sights with Indicator for Water and Oil

The indicator moves when flow is present, so it’s easy to visually confirm flow from a distance.

Flow Sights for Water and Oil

Often used in cooling, lubrication, and process systems.

High-Temperature Flow Sights for Water and Oil

Withstand twice the temperature of standard sights. These are rated for temperatures up to 400° F.

Quick-Clean Flow Sights for Water

To maintain a clear view of your process media without disrupting flow, twist the tubular window to clear debris and buildup with the internal wipers.

High-Pressure Flow Sights for Water and Oil

Rated for more than double the pressure of standard flow sights, these can withstand pressures up to 400 psi.

Flow Sights with Barbed Fittings
for Water, Oil, Air, and Inert Gas

Barbed fittings slide into soft plastic and rubber tubing.

Panel-Mount Flow Sights for Water, Oil, and Inert Gas

The included mounting ring lets you install these sights in instrument panels.

Compact Flow Sights for Chemicals

About half the height of other flow sights for chemicals, these fit in areas with limited clearance.

Flow Sights for Chemicals

Built to withstand harsh chemicals.

Flow Sights for Food and Beverage

Made of FDA-listed materials, these sights can be used with food and beverage. They have sanitary quick-clamp connections for easy disassembly and cleaning.

Liquid-Level Indicators

Oil-Level Indicators

High-Pressure Oil-Level Indicators

Shatter-Resistant Oil-Level Indicators

Water-Level Indicators

Tubular Gauge Glass

Gauge Glass for Heavy-Duty Level Indicators

Level Indicators with Shut-Off Valve

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

High-Pressure Oil-Level and Temperature Indicators

Through-Wall High-PressureOil-Level and Temperature Indicators

Shatter-Resistant Oil-Level and Temperature Indicators

Oil-Level and Temperature Indicators

Gaskets for Tubular Gauge Glass

Gaskets for Heavy-Duty Level Indicators

Heavy-Duty Level Indicators

Flow Sights

Compact Flow Sights for Water and Oil

Compact Flow Sights with Indicator for Water and Oil

Full-View Flow Sights for Water and Oil

Full-View Flow Sights with Indicator for Water and Oil

Flow Sights with Indicator for Water and Oil

Flow Sights for Water and Oil

High-Temperature Flow Sights for Water and Oil

Quick-Clean Flow Sights for Water

High-Pressure Flow Sights for Water and Oil

Flow Sights with Barbed Fittingsfor Water, Oil, Air, and Inert Gas

Panel-Mount Flow Sights for Water, Oil, and Inert Gas

Compact Flow Sights for Chemicals

Flow Sights for Chemicals

Flow Sights for Food and Beverage

Through-Wall High-Pressure
Oil-Level and Temperature Indicators

Flow Sights with Barbed Fittings
for Water, Oil, Air, and Inert Gas