【Sturdy Brass Material】Boltigen 1/2 inch Male NPT air compressor sight glass is made of high quality brass, which make the compressor oil sight plug stonger & more durable; the dome window is made of premium transparent tempered glass, provide you with clear level view of your equipment

【Product Standard】Boltigen 1/2'' NPT dome air compressor replacement sight window working pressure is：725 PSI (50 bar) ; working temperature is: 300 Celsius. Compared to original plastic sight glass, Boltigen brass sight gauge designed with new dome top, more beautiful and durable

【Easy to Install】You can easily finish installation the Boltigen air compressor oil plug by thread screwing to connect your compressor、 pump、Tank; No need help. The red thread coating guarantees no leakage. Perfect replacement for air compressor

【Wide Application】Boltigen 1/2 inch Male NPT coolant brass oil sight glass is perfect replacement for 60 gallon two stage vertical compressor、CH pump、Tank liquid level monitoring, making equipment work well; You deserve the Boltigen bulb air compressor oil level sight window

【Customer Service】Boltigen 1/2'' Male NPT compressor oil sight glass has 12 months warranty, great friendly customer service, any question about the Boltigen tank oil level indicator, please let us know first time, we will be glad to help you