Inch Sight Glass | McMaster-Carr

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706 Products

Sights

High-Visibility Sights

Easily view liquid movement and level changes from a distance—these sights have an indicator ball inside the glass window.

Shatter-Resistant Sights

The window and body are made from a single piece of plastic, making these sights more shatter resistant than sights with a glass window.

Through-Wall Sights

Mount these sights from the inside of your tank and secure with a lock nut.

Press-Fit Through-Wall Sights

Press these sights into a hole in your tank wall; no additional mounting nuts are needed. They mount from the outside.

Sights for Quick-Clamp Sanitary Tube Fittings

Monitor food, brewery, chemical, pharmaceutical, and biotech processing lines with these sights that attach to quick-clamp fittings for fast installation and easy removal for cleaning.

Weld-On Sights

Weld these sights to single-wall tanks.

Liquid-Level Indicators

High-Pressure Oil-Level Indicators

Monitor hydraulic fluid or oil level in pressurized applications, such as hydraulic systems where overflow is a concern.

Easy-View High-Pressure Oil-Level Indicators

The nylon body and window make these indicators shatter resistant.

Flexible Easy-View Liquid-Level Indicators

Bend these flexible indicators around the contours of your hydraulic fluid, oil, or water tank. Because their plastic resists shattering, they don’t need a protective shield like other liquid-level indicators, so you can check your tank’s level from any angle.

Chemical-Level Indicators

Check the level of liquids containing chemicals such as alcohol-based solvents, boric acid, and sodium bicarbonate.

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.

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.

Shatter-Resistant Oil-Level
and Temperature Indicators

The nylon body and window make these indicators shatter resistant.

High-Pressure Oil-Level and Temperature Indicators

Check both the temperature and the hydraulic fluid or oil level in a pressurized system.

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.

Flow Sights

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.

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.

Clear Glass, Mica, and Ceramic

Borosilicate Glass Rods and Discs

Also called Pyrex and Schott glass, these glass rods and discs resist clouding and pitting and are highly chemical and heat resistant.

Borosilicate Glass Tubes

Also called Pyrex and Schott glass, these glass tubes resist clouding and pitting and are highly chemical and heat resistant.

Pressure-Rated Borosilicate Glass Discs

Commonly used as sight glass.

Pressure-Rated Borosilicate Glass Tubes

These short glass tubes can be used as glass bowls in oil dispensers.

Borosilicate Glass Sheets

Also known as Pyrex and Schott glass, borosilicate sheets are heat resistant, clear, and have a super-smooth surface. They're used in a range of applications, from high-temperature viewports to 3D printing.

Borosilicate Glass Balls

Also called Pyrex and Schott glass, these glass balls resist clouding and pitting and are highly chemical and heat resistant.

Ultra-High-Temperature
Quartz Glass Rods and Discs

Able to withstand temperatures up to 2100° F, this quartz glass is useful in high-temperature applications that also require optical clarity, such as high-intensity lighting, fiber-optic production, and optical lens systems.

Ultra-High-Temperature Quartz Glass Tubes

Blistering temperatures won’t melt these quartz tubes, and rapid temperature shifts won’t cause them to crack.

Ultra-High-Temperature Quartz Glass Sheets

These sheets won't deform when exposed to temperatures up to 2100° F or from drastic temperature changes.

Clear Very High-Temperature Glass Ceramic

Combining the transparency of glass with the high heat resistance of ceramic, glass ceramic withstands temperatures up to 1255° F and resists rapid temperature changes.

Super-Flexible Corning® Willow® Glass

This glass bends like plastic but is eight times harder—it’s harder than tooth enamel but softer than quartz.

Impact- and Scratch-Resistant
Corning® Gorilla® Glass

Made of aluminosilicate that’s been chemically strengthened, this glass handles more wear and tear than other glass before scratching, cracking, or chipping. It’s often seen on mobile devices and enclosure display windows.

Antimicrobial and Scratch-Resistant
Corning® Gorilla® Glass

Often seen on mobile devices, human-machine interfaces, and other frequently touched surfaces, this aluminosilicate glass has been chemically strengthened and treated to resist bacteria, mold, mildew, algae, and fungi.

Wire-Reinforced Glass

Wire reinforcement and an acrylic coating increase this glass's impact resistance. It's often used in doors.