Such oil sight glass has the characteristics of good toughness, high strength, and wear resistance, making it durable with a long service life. It features simple installation, strong sealing, and convenient use. Oil sight glass is suitable for storage tanks, air compressors, pumps, and piping systems. It allows observation of the liquid level in the container and provides clear visibility of the oil's color and transparency, as well as the accumulation of water or other contaminants. It is constructed of aluminum alloy material. There are 5 sizes available. It is suitable for use in workshops, industrial projects, factories, and machinery. Item Name: Oil Sight Glass Material: Aluminum Alloy Features: Good Toughness, High Strength, Durability Size Details: Thread Outer Diameter: 18mm Size: 1.8cm/0.71" (Approx.) 22mm Size: 2.2cm/0.87" (Approx.) 24mm Size: 2.4cm/0.94" (Approx.) 26mm Size: 2.6cm/1.02" (Approx.) 30mm Size: 3cm/1.18" (Approx.) Thread Spacing: 0.15cm/0.06" (Approx.) Notes: Due to differences in lighting and screen settings, the item's color may vary slightly from the images. Please allow slight dimensional differences due to manual measurement. Package Includes: 1 x Oil Sight Glass