The 3/8" Spherical Compression Sleeve is designed for use with nylon or copper air brake tubing, meeting DOT compliance and SAE J246 requirements. Its all-brass construction ensures durability and reliability. This versatile fitting is sold individually and fits most makes and models, making it a practical and essential component for air brake systems. With its reliable construction and compliance with industry standards, this compression sleeve is a practical and beneficial choice for any air brake system.