Oil sight glasses help you monitor your air compressor’s oil level so you’ll know when it’s time to replenish the pump’s lubricant. At Master Tool Repair, we carry a variety of air compressor sight glasses in various sizes to fit a wide range of air compressor brands, makes, and models.

Oil sight glasses may seem like they are simple components, but their simplicity doesn’t make them any less essential. Regularly checking your machine’s oil levels can prevent wear and damage to its internal moving parts. Don’t allow your machine to grind to a halt due to a lack of lubrication! Browse our collection to find the air compressor sight glass you need for your machine. 

• Can be used for Rotary Screw applications.
• Max pressure: 300 PSI
• Threaded

Remember: The Outside Diameter (O.D.) of the thread always measures 1/4" over what the "MPT" size is. So, if you measure a 1" OD thread, order a 3/4" MPT sight.