These lead free brass hose fittings are designed to connect 5/16" barbed tubing to 1/4" male iron pipe threads, allowing for seamless transitions between different types of piping. Crafted from durable lead free brass material, they offer reliable performance and long-lasting durability for air, gas, fuel, or oil lines. With their compact size and versatile design, these fittings are ideal for various applications, from automotive and industrial to plumbing and HVAC systems. Ensure a secure and leak-proof connection by properly tightening these fittings during installation.