Item Package Quantity: 1 R410a adapter charging vacuum port adapter brass converter with thimble 5/16 inch SAE female quick couplers to 1/4 inch SAE male flare for mini split system Features: Brass construction, quick connect, good tensile strength, resists corrosion and AC low-loss fitting. Comes with full swivel tip. Features a 45-degree angle on the service port for easier access. Function: Converts 5/16 inch SAE charging-vacuum ports to accept 1/4 inch SAE gauge-hose sets. Application: Compatible with R410a mini split system air conditioners, HVAC and refrigeration service. Specifications: Material: Brass Connectors: 5/16 inch female to 1/4 inch male SAE with valve core depressor Thread diameter: 0.47 inch / 12 mm Thread size: 11 mm Total size: Diameter: 0.63 inch / 1.6 cm, Length: 2.09 inch / 5.3 cm Note: R410A ductless mini split systems are typically equipped with a unique charging port size to prevent incorrect refrigerant charging, such as R22. The new port size is 5/16 inch SAE, while many gauge sets feature 1/4 inch SAE connectors. This port adapter allows 5/16 inch SAE ports to be used with 1/4 inch SAE gauge sets.