If you own or maintain a breathing air compressor for scuba diving, firefighting, or medical air, using the right oil is critical. This is NRC 75 – a fully synthetic compressor oil specifically formulated for high-pressure breathing air systems. It's designed for brands like Bauer, L&W, Coltri, and other similar compressors that fill scuba tanks. Synthetic oil lasts longer, runs cleaner, and most importantly, it's safe for breathing air – it won't introduce harmful contaminants or carbon monoxide into the air stream. The bottle is 1 liter, enough for an oil change or top-up. It's brand new, unbranded (generic), but meets the specs for NRC 75. Using the correct oil isn't just about lubrication; it's about safety. Wrong oil can break down under high pressure and heat, causing dangerous byproducts. Always follow your compressor manufacturer's recommendations. This oil is for professionals, dive shops, fire departments, or serious hobbyists who maintain their own filling systems. Keep your compressor running smoothly and your air pure. A vital supply item for anyone in the breathing air business. Don't compromise on air quality – use oil made for the job.