Metric BSPP male brass oil level sight glass with hex head — clear window for fast, reliable oil level checks in air compressor and gearbox applications. Rated to 5 bar and supplied with a 1/2' BSPP male thread. Key benefits Immediate visual verification of oil level: reduces inspection time and helps prevent damage from low or overfilled oil. Robust brass construction and clear sight window: durable for workshop and industrial environments. Quick, secure installation: hex head design allows easy tightening with a wrench and direct screwin to BSPP female ports. Pressurerated to 5 bar: suitable for oil sumps and housings where operating pressure does not exceed the rating. Features and specifications Thread type: Metric BSPP (British Standard Parallel Pipe), male. Thread size: 1/2' (1/2'). Body material: Brass. Window: Transparent sight glass for oil level monitoring. Head style: Hex head for wrench installation. Pressure rating: 5 bar. Typical applications: air compressor gearbox oil level sighting and compatible gearbox or machinery oil reservoirs using BSPP 1/2' ports. Compatibility and use Designed to mate with BSPP female ports (metric BSPP threads). Confirm the receiving port is BSPP and 1/2' prior to installation. suited for low to mediumpressure oil reservoirs up to 5 bar common in air compressors and gearbox housings. Installation notes Screw into a clean, correctly sized BSPP female port and tighten using a wrench on the hex head. Use an appropriate thread sealant or tape compatible with oil systems if required by the installation (follow equipment manufacturer recommendations). Avoid overtightening to prevent damage to the sight glass window. Practical use cases Air compressor gearbox: mount on the gearbox housing for continuous visual monitoring of oil level during operation and maintenance checks. Workshop or industrial gearbox: retrofit or a worn sight glass on small gearboxes that accept a 1/2' BSPP male fitting to maintain proper lubrication management. Machinery oil reservoir with BSPP 1/2' port: provide a reliable inspection point for operators to quickly confirm oil presence and level before starting equipment. Why choose this sight glass Simple, dependable way to monitor oil without disassembly. Brass construction provides good corrosion resistance for oil environments. Hex head and BSPP male thread ensure straightforward fitting into compatible ports. Pressure rating and thread size clearly specified for correct selection and safe use. Check fitment: confirm your equipment uses a 1/2' BSPP female port and that the system pressure does not exceed 5 bar before installation.