LifCratms 4Pcs Oil Level Sight Glass G1/2" Male Threaded Aluminum Alloy Hex Oil Sight Glass Window Air Compressor Fittings Feature: -Good performance, can work in most operating environment. -High quality, can resistant to wear, high temperature and corrosion. -With sealing ring, have good sealing performance, not easy to leak. Specifications: Material: Aluminum Alloy Color: Silver Thread type: G1/2 (approx 20.1mm / 0.79 inch) Overall diameter: 26.1mm / 1.03 inch Height: 16.4mm / 0.65 inch Package Included: 4Pcs x Oil Level Gauge Sight Glass Notices: 1.The color of the item may have slightly different from the pictures due to different photography light. 2.Due to manual measurement, please allow an error of 1-3mm. Thank you for your understanding. We hope you have a pleasant and satisfied experience. If there are any problems, welcome to contact us, we will deal with it within 24 hours usually. If the item has any manufacturer defect problems, please contact us first, we want to improve your experience by giving you a replacement or refund. Please give us the opportunity to resolve your problem, Thank you!