1PC M42x2 Metric Male Aluminum Oil Level Sight Glass Window Hex Head — Air Compressor / Gearbox Key benefits Immediate visual oil level monitoring: builtin sight glass window lets you confirm oil level at a glance without disassembly. Simple replacement or upgrade: M42x2 male thread and hex head design make installation fast and secure on compatible ports. Durable, lightweight construction: aluminum body provides corrosion resistance and reduced weight compared with heavier metals, suited to industrial and workshop environments. Reduces downtime and maintenance errors: frequent visual checks help prevent overfill, underfill, and undetected leaks that can damage gearboxes and compressors. What it is and how it works This is a singlepiece (1PC) oil level sight glass with a metric M42x2 male thread. The transparent window integrated into the body provides a clear view of lubricant level inside the housing. The hex head profile on the body enables tightening and removal with standard hand tools for quick maintenance or replacement. Key attributes Thread: M42x2 metric male — designed to mate with corresponding M42x2 female ports. Material: aluminum body for corrosion resistance and lightweight durability. Feature: builtin sight glass window for visual oil level indication. Design: hex head for secure installation and removal. Quantity: 1 piece. Compatibility and use notes Intended for use on air compressor gearboxes and other gearboxes, housings or reservoirs that accept an M42x2 malethreaded oil level sight device. Compatible with oils and lubricants commonly used in compressors and gearboxes; confirm chemical compatibility with specialty fluids as needed. Installation tip: ensure mating threads and sealing surfaces are clean. Use the appropriate thread sealant or gasket per your equipment manufacturer's guidance. Do not overtighten to avoid damage to the sight glass or housing. Typical applications Air compressor maintenance: a damaged or missing sight glass on compressor gearbox housings to restore visual oillevel checking. Industrial gearbox inspection: install on gearboxes, reducers or small reservoirs to provide continuous, nonintrusive oillevel monitoring. Workshop and equipment rebuilds: include in kits or custom assemblies where a compact, threaded oil sight is required. Why customers choose this product Straightforward, reliable function — lets technicians and operators verify lubricant level quickly and without tools. Metric M42x2 thread and hex head allow broad compatibility with standard ports and easy serviceability. Aluminum construction balances durability with lighter weight for repeated use in maintenance environments. Specifications (from product title) Quantity: 1PC Thread: M42x2 (metric male) Material: Aluminum Feature: Oil level sight glass window Head: Hex head Intended for: Air compressor gearbox (and other compatible gearboxes/housings) Care and maintenance Inspect sight glass periodically for cracks, clouding, or signs of leakage. immediately if damaged to maintain proper sealing and accurate oil level visibility. When removing or reinstalling, follow equipment manufacturer torque and sealing recommendations.