39476916 Oil Sight Glass Oil Level Indicator Viewing Lens for Rotary Screw Air Compressor

Field View

Unlike a controller or valve, this part does no switching—it tells the human what the machine cannot say on its own. Mounted in the oil tank or gearcase wall, the borosilicate-style lens and sealed body give a stable window into the lubrication circuit. During daily walkaround checks, the mechanic sees oil film height, water haze, sludge darkening, or froth from cavitation/overfill—then acts before alarms trip.

Key Benefits

• Instant Oil Check: Read level and clarity without opening the reservoir or draining oil.
• Early Warning: Foam, milky color, or dark sludge show up before sensor faults appear.
• Leak-Resistant Seat: Proper gasket and hex-body design reduce weeping at the tank wall.
• Heat-Clear Optics: Transparent lens stays readable under warm compressor-room conditions.
• Also Called: oil sight glass, oil level indicator, oil level gauge, sight glass lens, view glass, oil mirror, level view window.

Common Applications

• Rotary screw air compressors and portable compressor lube reservoirs
• Industrial plants, rental fleets, workshops, and maintenance bays
• Compressor preventive maintenance and reservoir refurbishment
• Spare-parts bins for service technicians