The NOT FOR AIR BRAKE SYSTEMS fitting from Fittings Unlimited Inc is specifically designed for applications outside of air brake systems. This fitting is constructed from high-quality materials, ensuring durability and reliability in various fluid transfer applications. It is important to note that this fitting is not suitable for air brake systems, making it essential for users to select the appropriate fittings for their specific needs. Its robust design and compliance with industry standards make it a versatile choice for engineers and technicians.