Oil Sight Glasses

The Oil Sight Glass product line consists of the original Oil Sight Glass, the Oil Sight Glass & Level Monitor,  the Oil Level Indicator, and the 3-D BullsEye. Products available through our partnership with Esco Products, Inc. provide lubrication management professionals with a complete and immediate visual oil analysis.

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A collection of oil sight glasses and fluid level indicators of various shapes and sizes, standing upright. They have transparent bodies, each with visible yellow oil levels and connected metal components.

The Oil Sight Glass is a clear acrylic cylinder that installs in the drain port of the oil reservoir of pumps, gearboxes, bearing housings and other lubrication-critical pieces of equipment. It provides continuous fluid monitoring of clarity, color, sediment, and water contamination. The drain valve allows for discharge of accumulated water. These products enable personnel in many industries to constantly manage the condition of their oil.

Green and white logo of Esco Products, Inc. featuring the word ESCO in bold green letters inside an oval shape, with Esco Products, Inc. written below in smaller green font.
A plastic oil lubricator with a transparent body and metal fittings, containing yellow oil and a small air valve at the bottom.

Esco Single-Piece Oil Sight Glass

Machined out of one solid piece of acrylic, this heavy-duty design eliminates any bonded parts that would wear out over time. 

Close-up of a clear and black oil-dispensing nozzle with yellow oil inside. The nozzle is partially visible and appears connected to a larger device, with a circular transparent section containing the oil.

3-D Bullseye Oil Sight Glass

The innovators at Esco have improved upon the old-fashioned sight plug with the creation of a replacement sight window called the 3-D BullsEye.

A transparent cylinder filled with amber liquid, featuring gold-colored fittings at both ends. The design suggests its a component, possibly used for filtration or measurement purposes.

Large Volume Oil Sight Glass

Commonly used on large oil reservoirs, or on equipment operated in environments with regular high pressure wash downs or high condensation problems, where water contamination cannot be avoided or minimized.

A cylindrical hydraulic flow indicator with a transparent section showing amber fluid. It has a white outer casing, metal bolts, and two brass connectors on the top and bottom.

High Temperature Oil Sight Glass

The High Temperature Oil Sight Glass is your answer when radiant heat from nearby equipment or unusually high operating temperatures.

A vertical cylindrical liquid level indicator with a black top cap, a transparent body, and two colored bands (red and green) encircling it. It contains yellow liquid, and has a brass nozzle and a bottom valve.

Oil Sight Glass & Level Monitor

The Oil Level Indicator (OLI) was developed in response to the need of maintenance professionals to gauge the oil level inside large tanks, gearboxes and reservoirs.

Image of three ESCO test strips labeled TEMP, COLOR, and CLARITY. The TEMP strip displays a vertical gradient from black to green with numerical values. The COLOR strip shows shades of brown, and the CLARITY strip shows shades of gray.

Magnetic Oil Monitors

(MOM) kit contains three durable magnetic strips that adhere directly to equipment, and provide real-time feedback on oil temperature, color, and clarity.