This Qdyzpp brass adapter fitting is designed for AC R134a refrigerant systems, offering a practical solution for connecting different size fittings. The adapter features a 1/4-inch male end that transitions to a 1/2-inch female connection, making it versatile for various HVAC applications. Built with durable brass construction, this fitting includes an integrated valve core for controlled refrigerant flow. The robust design helps maintain a secure seal while allowing for necessary system maintenance and refrigerant charging. Perfect for professional HVAC technicians and DIY enthusiasts working with R134a systems, this adapter provides the reliability needed for air conditioning service work. The precision-machined threads ensure proper alignment and connection stability when joining different size lines. 1/2 Inch Acme Female x 1/4 Inch Male Flare w/ Core. Connects R12 Hose to R134A rt tank. overall Dimension 3/4" Length 1.5"