Monitor hydraulic fluid or oil level in pressurized applications.

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

These indicators mount from the outside of your tank.

The nylon body and window make these indicators shatter resistant.

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

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

Avoid overfilling—these indicators pop up when your tank is almost full.

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

Weld these sights to single-wall tanks.

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

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

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

Often used in kilns and other heating equipment, these sights have a quartz window that can withstand temperatures up to 1600° F. They're also known as peep sights.

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

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