M22 x 1.5 mm Metric Male Brass Oil Level Sight Glass Window — Hex Head for Air Compressor Gearbox Key benefits Instant visual oillevel check: Builtin clear sight window lets you confirm oil level at a glance without opening the gearbox or reservoir. Durable, corrosionresistant construction: Solid brass body resists rust and wear for long service life in oil and lubricant environments. Simple installation and removal: Male M22x1.5 metric thread and hex head design allow fast, secure fitting with standard wrenches. Reduces maintenance time and risk: Monitoring oil levels externally lowers the chance of contamination and simplifies routine inspection. Main features and specifications Thread size: M22 x 1.5 mm (metric male thread) — fits standard M22x1.5 female ports. Material: Brass body for strength and corrosion resistance. Window: Integrated sight window for visual oillevel indication. Head style: Hex head for wrench tightening and reliable seating. Intended application: Designed for use on air compressor gearboxes; also applicable to gearboxes and oil reservoirs with compatible thread. Functionality and compatibility Designed specifically to provide a clear, external view of lubricant level inside a gearbox or reservoir. Compatible with oil and most lubricants used in compressors and gearboxes when installed in a matching M22x1.5 female threaded port. Install with appropriate thread sealing method (PTFE tape or compatible sealant) as required by your application to ensure a secure, leakminimized connection. Use cases Air compressor gearbox: Install in the gearbox cover or housing to monitor lubricant level without disassembly, enabling quick visual checks before or during operation. Small industrial gearbox or reducer: a plug or port cap with this sight glass to continuously observe oil level and simplify preventative maintenance. Mobile equipment or stationary pumps: Use where an M22x1.5 port exists and a compact, durable sight window is needed for periodic oil inspections. Why choose this sight glass Practical solution for routine maintenance: Minimizes downtime by allowing fast, onthespot oil checks. Robust materials and straightforward design: Brass body and hex head make it suitable for workshop and industrial environments. Exact fit for metric M22x1.5 ports: Provides a direct, reliable replacement or upgrade for compatible equipment. Installation tips Confirm the port thread is M22 x 1.5 before installation. Clean mating threads and apply appropriate thread sealant or PTFE tape if required by your system specifications. Tighten using a correctly sized wrench on the hex head; avoid overtorquing to prevent damage to threads or sight window. This M22x1.5mm male brass sight glass with hex head offers a simple, reliable way to monitor oil levels on air compressor gearboxes and other compatible equipment.