Upgrade your HVAC system connections with the Copper Pipe Extension Joint Connectors. This set includes four adapters—two 1/4" and two 3/8"—each fitted with durable flare nuts, offering a versatile solution for your copper pipe extension needs. Made of premium solid copper, these connectors resist rust and corrosion, delivering dependable and long-lasting performance. Engineered to fit 1/4" (6.35 mm) and 3/8" (9.53 mm) copper tubes, the connectors ensure a tight and reliable fit for air conditioning, refrigeration, gas, vacuum, and fuel systems. Whether you're extending mini split line sets or setting up HVAC quick connect fittings, these joint connectors are built to handle diverse applications. Installation is simple and hassle-free—no welding required. With just a wrench, you can achieve a strong and secure connection in minutes. Designed for both professionals and DIY enthusiasts, these copper pipe adapters provide durability, convenience, and peace of mind for your HVAC projects.