The TEE-THREAD RUN 3/8 X 1/4 is a versatile and reliable product designed for use with nylon or copper air brake tubing. It is DOT compliant and meets SAE J246 requirements, ensuring its high quality and safety. Made with all brass construction, this fitting features a pipe thread sealant that offers numerous benefits. It provides an instant no-leak assembly, saving both time and expense. Unlike tape shredding or liquid sealant washout, this pre-applied sealant will not contaminate systems. Additionally, it can be reused up to five times and provides excellent thread lubrication to prevent galling. Sold individually, it fits most makes and models.