Oil Peep Sights | McMaster-Carr

	Pipe Size Pipe Size

	Thread Type Thread Type

NPT

NPTF

UN/UNF (SAE Straight)

BSPP

Metric

	Material Material

	For Liquid Type For Liquid Type

Clear

Dark

	For Use With For Use With

	System of Measurement System of Measurement

Inch

Metric

	Window Diameter Window Diameter

	Maximum Pressure Maximum Pressure

	Maximum Temperature Maximum Temperature

	Window Material Window Material

Glass

Plastic

	Connection Style Connection Style

Threaded

Quick Clamp

Flanged

	Hex Size Hex Size

	Mount Type Mount Type

	Connection Type Connection Type


Pipe	Tube

	Minimum Temperature Minimum Temperature

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

DFARS Specialty Metals
COTS-Exempt

	Seal Material Seal Material

Buna-N Rubber

Silicone Rubber

Neoprene Rubber

Fluoroelastomer Rubber

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

RoHS Compliant

RoHS Compliant with
Exemptions

	Thread Size Thread Size

	For Hole Diameter For Hole Diameter

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

REACH Compliant

	OD OD

	Finish Finish

231 Products

Sights

These sights have a glass window.

High-Visibility Sights

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

Easy-View Sights

View tank contents from multiple angles through the plastic domed window.

Easy-View All-Plastic Sights

Machined from one piece of stain- and impact-resistant plastic.

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.

Sights for Oil Inspection

Continuously monitor oil quality through the clear plastic reservoir, and use the attached drain valve to remove water accumulation.

High-Pressure Sights

With a thick glass window fused to a metal body, these sights resist cracking at high pressures.

Flanged Sights

Fasten the extended flange to tank walls.

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.

High-Vacuum Sights for Quick-Clamp Fittings

Designed with quick-clamp (KF) connections, these sights connect to a port on a high-vacuum chamber, so you can monitor what's happening inside.

Weld-On Sights

Weld these sights to single-wall tanks.

High-Vacuum Flanged Sights

Add a window to your high-vacuum system. With a pane of glass sealed inside a high-vacuum CF flange, these sights bolt onto vacuum chambers, tee fittings, and manifolds.