This nylon tubing insert is designed for use with polyethylene nylon and plastic tubing, making it a practical choice for various applications. It is important to note that it is not suitable for air brake use. The fittings meet SAE J246 requirements and are DOT compliant, ensuring their quality and reliability. Constructed with all brass, this product is durable and long-lasting. Sold individually, it fits most makes and models, providing convenience and versatility. Choose this reliable and compliant nylon tubing insert for your tubing needs.