How to Use: The actual liquid level position screw oil in the oil tank can be placed on the tank sight glass to see, to judge from the outside to run defenders screw oil meets the operating condition. NOTE: Get your air compressor shut down and pressure relief when change oil level sight glass. MATERIAL The main body is made of aluminum alloy, which is not easy to wear and burst compares to plastic material. It can work in high temperature environment. GOOD SEALING The sealing is achieved with a gasket on the periphery. It can provide good sealing performance and prevent oil leakage during use. WIDELY APPLICATION Oil Level Sight Glass used widely to check the oil level of the pump in the air compressor. 1/2PT Level Sight Glass M22 Level Sight Glass 48mm Piston Ring Set 48mm Piston 1/4BSP Pressure Gauge Add to Cart Add to Cart Add to Cart Buying Options Add to Cart Customer Reviews 4.4 out of 5 stars 145 4.6 out of 5 stars 15 4.0 out of 5 stars 43 5.0 out of 5 stars 1 2.1 out of 5 stars 2 Price $7.79$7.79 $8.29$8.29 $9.19$9.19 — no data $9.39$9.39 Parts Level Sight Glass Level Sight Glass Piston Ring Set Piston Pressure Gauge Thread Size 1/2PT M22 X X 1/4BSP Diameter X X 48mm 48mm X