2Pcs 1" NPT Male Threaded Oil Level Gauge Sight Glass Aluminum Oil Sight Glass Air Compressor Fittings for Belt Driven Air Compressor (1”NPT-2pcs)

I have an old compressor 50+ years old and the sight glass has always been unreadable. This popped up one day so thought why not. Glad I got this. Perfect for and easy to read oil levels

Ordered 1 inch label and package say 1 inch but product is 1 1/4. Can't use waste of my time

Excellent quality. I purchased these for use as site glasses for a dust collector bin in my shop. I was able to drill out the star with the red dot with a carbide cutter very easily and this allowed me to use them as a site level glass to see when the dust can was filling up. This worked very good.